{"id":2989,"date":"2026-08-01T15:20:15","date_gmt":"2026-08-01T22:20:15","guid":{"rendered":"https:\/\/www.ultalabtests.com\/blog\/?p=2989"},"modified":"2026-08-07T11:16:16","modified_gmt":"2026-08-07T18:16:16","slug":"cbc-anemia-blood-tests","status":"publish","type":"post","link":"https:\/\/www.ultalabtests.com\/blog\/blood-disorders\/cbc-anemia-blood-tests\/","title":{"rendered":"CBC and Anemia Blood Tests: Hemoglobin, MCV, Iron, Ferritin, Vitamin B12, and Folate"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">CBC and anemia blood tests evaluate the number, size, and distribution of blood cells and help organize common anemia and blood-cell patterns.<sup><a href=\"#ref-1\">1<\/a><\/sup> A <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">complete blood count with differential and platelets<\/a> measures red cells, hemoglobin, hematocrit, red-cell indices, white cells, and platelets.<sup><a href=\"#ref-3\">3<\/a><\/sup> <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">Ferritin<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/iron-and-total-iron-binding-capacity-test\">iron and TIBC<\/a>, transferrin saturation, <a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-b12-test\">vitamin B12<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/folate-serum-test\">folate<\/a>, and <a href=\"https:\/\/www.ultalabtests.com\/test\/reticulocyte-count\">reticulocytes<\/a> can help narrow the questions raised by a CBC. No single result identifies every cause. Serum iron alone cannot diagnose iron deficiency, and ferritin can rise during inflammation. Marked symptoms, active bleeding, chest pain, fainting, severe shortness of breath, or a critically abnormal count require prompt medical evaluation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Part of the Ulta Lab Tests Knowledge Center<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/complete-guide-to-lab-tests-and-blood-work\/\">The Complete Guide to Lab Tests and Blood Work<\/a> explains specimens, panels, screening, monitoring, and test selection.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/how-to-read-lab-results\/\">How to Read Lab Results<\/a> explains reference intervals, units, flags, decision thresholds, and trends.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/direct-access-lab-testing\/\">Direct-Access Lab Testing<\/a> explains ordering, preparation, collection, results, and follow-up.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/nutrition\/vitamin-nutrient-deficiency-tests\/\">Vitamin and Nutrient Deficiency Tests<\/a> provides broader context for iron, vitamin B12, and folate status.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/digestive-system\/digestive-health-lab-tests\/\">Digestive Health Lab Tests<\/a> provides context for malabsorption and gastrointestinal blood-loss questions.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/kidney\/kidney-health\/kidney-function-tests\/\">Kidney Function Tests<\/a> explains kidney-related testing that may matter when anemia accompanies kidney disease.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/cancer\/cancer-blood-tests-and-tumor-markers-uses-limitations-and-follow-upcancer-blood-tests-tumor-markers\/\">Cancer Blood Tests and Tumor Markers<\/a> explains the limits of blood testing in cancer evaluation.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Key Facts About CBC and Anemia Blood Tests<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Core test or test group<\/th><th class=\"has-text-align-left\" data-align=\"left\">Common specimen<\/th><th class=\"has-text-align-left\" data-align=\"left\">Fasting or timing need<\/th><th class=\"has-text-align-left\" data-align=\"left\">Primary purpose<\/th><th class=\"has-text-align-left\" data-align=\"left\">Common use status<\/th><th class=\"has-text-align-left\" data-align=\"left\">Major limitation<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC with differential and platelets<\/a><\/td><td>Whole blood<\/td><td>Usually no fasting solely for the CBC; follow instructions for tests ordered with it<\/td><td>Counts and characterizes red cells, white cells, and platelets<\/td><td>Common or first-line<\/td><td>Shows a pattern but usually not its cause<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">Ferritin<\/a><\/td><td>Serum<\/td><td>Often no special preparation; follow the current product instructions<\/td><td>Estimates stored iron<\/td><td>Common or targeted<\/td><td>Can be normal or high during inflammation even when available iron is limited<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/iron-and-total-iron-binding-capacity-test\">Iron, TIBC, and calculated transferrin saturation<\/a><\/td><td>Serum<\/td><td>Morning collection and fasting may be requested because circulating iron varies<\/td><td>Assesses circulating iron and iron-binding capacity<\/td><td>Common or targeted<\/td><td>Serum iron varies and must not be interpreted alone<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/reticulocyte-count\">Reticulocyte count<\/a><\/td><td>Whole blood<\/td><td>Usually no special preparation<\/td><td>Assesses the marrow response to a red-cell problem<\/td><td>Risk-based, targeted, or monitoring<\/td><td>Requires context from hemoglobin, timing, and the clinical situation<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-b12-test\">Vitamin B12<\/a> and <a href=\"https:\/\/www.ultalabtests.com\/test\/folate-serum-test\">folate<\/a><\/td><td>Serum<\/td><td>Follow specific instructions; supplements may affect results<\/td><td>Evaluates nutrient-related contributors to macrocytosis or anemia<\/td><td>Risk-based or targeted<\/td><td>Results may be borderline or influenced by supplementation and other conditions<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/lactate-dehydrogenase-test\">LDH<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/haptoglobin\">haptoglobin<\/a>, and <a href=\"https:\/\/www.ultalabtests.com\/test\/bilirubin-fractionated\">fractionated bilirubin<\/a><\/td><td>Serum<\/td><td>Preparation varies by test and panel<\/td><td>Provides supporting evidence when increased red-cell breakdown is suspected<\/td><td>Specialist- or clinician-directed<\/td><td>None is specific for hemolysis when interpreted alone<\/td><\/tr><tr><td><a href=\"https:\/\/medlineplus.gov\/lab-tests\/blood-smear\/\">Peripheral blood smear<\/a><\/td><td>Whole blood on a slide<\/td><td>No fasting solely for the smear<\/td><td>Allows microscopic review of cell appearance<\/td><td>Clinician- or laboratory-directed<\/td><td>Interpretation is morphology-dependent and does not establish a diagnosis by itself<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Is CBC, Anemia, Iron, and Blood Cell Testing?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Blood contains red blood cells, several types of white blood cells, platelets, and plasma. Red blood cells carry oxygen through hemoglobin. White blood cells participate in immune defense and inflammatory responses. Platelets help the body form clots. Bone marrow continuously produces these cells, while the kidneys, liver, digestive tract, immune system, nutrients, medications, bleeding, and inherited traits can influence their numbers or characteristics.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC test<\/a> is usually the central starting point. It can show whether hemoglobin or hematocrit is outside the reporting laboratory's interval, whether red cells are smaller or larger than expected, whether white cells or a particular subtype are increased or decreased, and whether the platelet count is abnormal.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Follow-up tests are selected from the pattern and the patient's history. Iron studies may help distinguish depleted iron stores from restricted iron availability. B12 and folate tests can add information when macrocytosis, dietary risk, malabsorption, neurologic symptoms, or certain medications are relevant. Reticulocytes can show whether marrow production appears increased or inadequate for the degree of anemia. LDH, haptoglobin, bilirubin, and a smear may support a clinician's evaluation of red-cell destruction. For related context, see <a href=\"https:\/\/www.ultalabtests.com\/blog\/nutrition\/vitamin-nutrient-deficiency-tests\/\">Vitamin and Nutrient Deficiency Tests<\/a> and <a href=\"https:\/\/www.ultalabtests.com\/blog\/digestive-system\/digestive-health-lab-tests\/\">Digestive Health Lab Tests<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Symptoms such as fatigue, weakness, dizziness, headaches, exertional shortness of breath, bruising, or recurrent infections are not specific. Testing can add objective information, but the cause may still require a history, physical examination, medication review, bleeding evaluation, imaging, endoscopy, bone-marrow testing, or specialist assessment.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Blood-Count and Anemia Testing Matters<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Abnormal blood counts may be temporary, medication-related, nutritional, inflammatory, infectious, inherited, or connected to bleeding, organ disease, or bone-marrow conditions. Establishing a baseline can help distinguish a longstanding personal pattern from a new change. Repeating a test under appropriate conditions may show whether an abnormality is resolving, stable, or progressing. Because reduced kidney function can contribute to anemia, <a href=\"https:\/\/www.ultalabtests.com\/blog\/kidney\/kidney-health\/kidney-function-tests\/\">Kidney Function Tests<\/a> may provide useful context when kidney disease is part of the clinical question.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For anemia questions, useful information often comes from combining the CBC pattern with selected follow-up tests rather than ordering every possible test. A focused approach reduces incidental findings and helps ensure that each result answers a defined question.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Laboratory Testing May Reveal<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Question<\/th><th class=\"has-text-align-left\" data-align=\"left\">Tests that may add information<\/th><th class=\"has-text-align-left\" data-align=\"left\">What the pattern may suggest<\/th><\/tr><\/thead><tbody><tr><td>Is anemia present?<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Hemoglobin, hematocrit, and red-cell count within a CBC<\/a><\/td><td>Whether oxygen-carrying red-cell measures are below the laboratory's interval<\/td><\/tr><tr><td>What is the red-cell size pattern?<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">MCV, MCH, MCHC, and RDW<\/a><\/td><td>Microcytic, normocytic, macrocytic, or mixed-size clues<\/td><\/tr><tr><td>Are iron stores or iron availability reduced?<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">Ferritin<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/iron-and-total-iron-binding-capacity-test\">iron\/TIBC<\/a>, and transferrin saturation<\/td><td>A pattern that may fit depleted stores, restricted availability, or possible iron excess<\/td><\/tr><tr><td>Is the marrow responding?<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/reticulocyte-count\">Reticulocyte count<\/a><\/td><td>Whether young red-cell production is relatively increased, appropriate, or insufficient<\/td><\/tr><tr><td>Could B12 or folate status contribute?<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-b12-test\">Vitamin B12<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/folate-serum-test\">folate<\/a>, and selected confirmatory tests<\/td><td>Nutrient patterns that may contribute to large red cells or anemia<\/td><\/tr><tr><td>Is increased red-cell breakdown being considered?<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/lactate-dehydrogenase-test\">LDH<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/haptoglobin\">haptoglobin<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/bilirubin-fractionated\">fractionated bilirubin<\/a>, reticulocytes, and smear<\/td><td>A supporting pattern that may warrant clinician-directed hemolysis evaluation<\/td><\/tr><tr><td>Are white cells or platelets abnormal?<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">WBC, differential, and platelet count<\/a><\/td><td>Whether a count or subtype is high, low, or otherwise flagged for follow-up<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Laboratory Testing Cannot Reveal by Itself<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Testing cannot establish by itself<\/th><th class=\"has-text-align-left\" data-align=\"left\">Why not<\/th><th class=\"has-text-align-left\" data-align=\"left\">Other evaluation that may be needed<\/th><\/tr><\/thead><tbody><tr><td>The source of blood loss<\/td><td>A CBC or iron pattern can show consequences of blood loss but not its location<\/td><td>History, examination, gynecologic evaluation, stool testing, endoscopy, imaging, or other procedures<\/td><\/tr><tr><td>The cause of an abnormal WBC or platelet count<\/td><td>Infection, inflammation, medications, physiologic stress, marrow disorders, and other causes can overlap<\/td><td>Repeat testing, smear review, medication assessment, infectious evaluation, or hematology consultation<\/td><\/tr><tr><td>A bone-marrow disorder<\/td><td>Blood counts can raise concern but cannot directly examine marrow architecture<\/td><td>Specialist review, flow cytometry, molecular testing, or bone-marrow examination when appropriate<\/td><\/tr><tr><td>Whether an abnormality is clinically urgent in every patient<\/td><td>Urgency depends on severity, symptoms, trend, comorbidities, pregnancy, medications, and active bleeding<\/td><td>Prompt professional assessment or emergency evaluation<\/td><\/tr><tr><td>Whether a person should begin iron, B12, or folate treatment<\/td><td>The cause, severity, contraindications, and treatment plan require individualized evaluation<\/td><td>Clinician-directed diagnosis, treatment selection, and follow-up<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A CBC can reveal a pattern that deserves evaluation, but it is not a stand-alone cancer screening or diagnostic test. See <a href=\"https:\/\/www.ultalabtests.com\/blog\/cancer\/cancer-blood-tests-and-tumor-markers-uses-limitations-and-follow-upcancer-blood-tests-tumor-markers\/\">Cancer Blood Tests and Tumor Markers<\/a> for the uses and limits of cancer-related blood testing.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Symptoms, Risk Factors, and Patient Scenarios<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Symptom, risk factor, medication, or life stage<\/th><th class=\"has-text-align-left\" data-align=\"left\">Possible explanations<\/th><th class=\"has-text-align-left\" data-align=\"left\">Laboratory tests that may add information<\/th><th class=\"has-text-align-left\" data-align=\"left\">Nonlaboratory evaluation that may be needed<\/th><th class=\"has-text-align-left\" data-align=\"left\">Safety or urgency note<\/th><\/tr><\/thead><tbody><tr><td>Persistent fatigue or reduced exercise tolerance<\/td><td>Anemia, iron depletion, nutrient deficiency, inflammation, sleep or cardiopulmonary conditions, and many other causes<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">ferritin<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/iron-and-total-iron-binding-capacity-test\">iron\/TIBC<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-b12-test\">B12<\/a>, and <a href=\"https:\/\/www.ultalabtests.com\/test\/folate-serum-test\">folate<\/a>, selected to fit the history<\/td><td>History, examination, and evaluation of nonhematologic causes<\/td><td>Chest pain, fainting, or severe shortness of breath requires prompt care<\/td><\/tr><tr><td>Heavy menstrual bleeding, gastrointestinal symptoms, frequent blood donation, or recent surgery<\/td><td>Blood loss with or without depleted iron stores<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">ferritin<\/a>, and <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-iron-and-total-iron-binding-capacity-panel\">ferritin\/iron\/TIBC panel<\/a><\/td><td>Evaluation to identify and manage the source of blood loss<\/td><td>Active heavy bleeding, fainting, rapid pulse, or severe weakness is urgent<\/td><\/tr><tr><td>Vegetarian or vegan diet, malabsorption risk, gastric surgery, or long-term use of medicines that affect B12 absorption<\/td><td>Vitamin B12 or iron-related risk; other nutrient issues may coexist<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-b12-test\">Vitamin B12<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/methylmalonic-acid-test\">methylmalonic acid when indicated<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/folate-serum-test\">folate<\/a>, CBC, and iron studies<\/td><td>Dietary and gastrointestinal assessment<\/td><td>New numbness, gait change, confusion, or severe weakness warrants prompt evaluation<\/td><\/tr><tr><td>Fever, recurrent infections, or a medication known to affect marrow<\/td><td>Infection, medication effect, immune disorder, or marrow suppression<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC with differential<\/a> or <a href=\"https:\/\/www.ultalabtests.com\/test\/white-blood-cell-count-test-with-differential\">WBC count with differential<\/a><\/td><td>Prompt clinical evaluation, cultures or imaging when indicated, and medication review<\/td><td>Fever with a known or suspected very low neutrophil count can be an emergency<\/td><\/tr><tr><td>Easy bruising, petechiae, nosebleeds, or prolonged bleeding<\/td><td>Low platelets, platelet dysfunction, coagulation problems, medications, liver disease, or other causes<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC platelet count<\/a>; additional testing is clinician-directed<\/td><td>Examination and bleeding-history assessment<\/td><td>Uncontrolled bleeding, blood in vomit or stool, severe headache, or neurologic symptoms requires urgent care<\/td><\/tr><tr><td>Jaundice, dark urine, or an unexpectedly high reticulocyte count<\/td><td>Increased red-cell breakdown, liver or biliary causes, or other conditions<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/reticulocyte-count\">Reticulocytes<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/lactate-dehydrogenase-test\">LDH<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/haptoglobin\">haptoglobin<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/bilirubin-fractionated\">fractionated bilirubin<\/a>, CBC, and clinician-directed smear<\/td><td>Physical examination and targeted liver, transfusion, medication, or hematology evaluation<\/td><td>Rapidly worsening jaundice, severe weakness, chest symptoms, or dark urine after transfusion requires prompt care<\/td><\/tr><tr><td>Pregnancy<\/td><td>Physiologic blood-volume changes, iron or folate needs, bleeding, and pregnancy-specific conditions<\/td><td>CBC and targeted nutrient or iron studies selected by prenatal care<\/td><td>Prenatal-clinician oversight<\/td><td>Do not rely on direct-access testing for urgent pregnancy symptoms<\/td><\/tr><tr><td>Unexpected abnormal result without symptoms<\/td><td>Biological variation, hydration, recent illness, exercise, medication, specimen issue, or an emerging condition<\/td><td>Repeat CBC or targeted confirmatory testing based on the pattern<\/td><td>Clinical review of trend, history, and prior results<\/td><td>A laboratory critical-value notice should be followed immediately<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Testing-Tier Overview<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Common or First-Line Tests<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC with differential and platelets<\/a> is the usual starting test when the question involves anemia, abnormal blood cells, infection-related patterns, bruising, or a prior abnormal count. <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">Ferritin<\/a> and <a href=\"https:\/\/www.ultalabtests.com\/test\/iron-and-total-iron-binding-capacity-test\">iron\/TIBC<\/a> are common follow-up tests when iron status is relevant. These tests are not automatically needed for every person or every episode of fatigue.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Risk-Based or Targeted Tests<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.ultalabtests.com\/test\/reticulocyte-count\">Reticulocytes<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-b12-test\">vitamin B12<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/folate-serum-test\">folate<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/methylmalonic-acid-test\">methylmalonic acid<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/transferrin-test\">transferrin<\/a>, and selected hemolysis markers are most useful when symptoms, risk factors, MCV, RDW, iron results, medications, diet, malabsorption risk, or prior testing provide a reason.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Monitoring Tests<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CBC, ferritin, iron studies, and reticulocytes may be repeated to monitor a known condition or a clinician-directed treatment plan. The useful interval depends on the condition, expected biological response, treatment, and consequence of missing a worsening result.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Specialist-Directed Tests<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A <a href=\"https:\/\/medlineplus.gov\/lab-tests\/blood-smear\/\">peripheral blood smear<\/a>, bone-marrow examination, flow cytometry, hemoglobin analysis, molecular testing, and extensive hemolysis workups are generally selected and interpreted in a clinician or specialist context. They should not be treated as routine wellness screens.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Emerging or Insufficiently Validated Approaches<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Newer cell indices, algorithm-derived ratios, and specialized iron-availability markers may be useful in selected settings, but their interpretation and clinical utility vary by population, assay, and guideline. They should not replace established first-line evaluation merely because they are newer or more detailed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tests Generally Not Appropriate for Broad Routine Screening<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Bone-marrow testing, broad hematologic molecular panels, extensive hemolysis testing, and inherited-condition testing are generally inappropriate without a defined clinical question. Large panels can generate incidental findings, false alarms, unnecessary repeats, anxiety, and cost without improving the answer to the patient's question.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">CBC Component Crosswalk<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The CBC is a group of related measurements. The rows below describe general pattern logic\u2014not diagnoses.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">CBC component<\/th><th class=\"has-text-align-left\" data-align=\"left\">Common alias<\/th><th class=\"has-text-align-left\" data-align=\"left\">What it measures<\/th><th class=\"has-text-align-left\" data-align=\"left\">General interpretation clues<\/th><th class=\"has-text-align-left\" data-align=\"left\">Common influences<\/th><th class=\"has-text-align-left\" data-align=\"left\">What it cannot establish by itself<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Hemoglobin<\/a><\/td><td>Hgb or Hb<\/td><td>Concentration of the oxygen-carrying protein in red cells<\/td><td>Low may indicate anemia; high may reflect increased red-cell concentration or mass<\/td><td>Hydration, altitude, smoking, pregnancy, bleeding, transfusion, and disease<\/td><td>The cause, severity of symptoms, or need for treatment<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Hematocrit<\/a><\/td><td>Hct<\/td><td>Percentage of blood volume made up of red cells<\/td><td>Often moves with hemoglobin but can be affected by plasma volume<\/td><td>Dehydration, fluid overload, pregnancy, bleeding, and transfusion<\/td><td>The cause of a low or high value<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/red-blood-cell-count-test\">Red blood cell count<\/a><\/td><td>RBC count or erythrocyte count<\/td><td>Number of red cells in a volume of blood<\/td><td>Helps interpret hemoglobin and MCV patterns<\/td><td>Hydration, altitude, smoking, pregnancy, marrow production, and red-cell lifespan<\/td><td>Whether red cells function normally<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Mean corpuscular volume<\/a><\/td><td>MCV<\/td><td>Average red-cell size<\/td><td>Low suggests a microcytic pattern; within range a normocytic pattern; high a macrocytic pattern<\/td><td>Mixed deficiencies, transfusion, alcohol, medications, reticulocytosis, and specimen factors<\/td><td>The specific cause of anemia<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Mean corpuscular hemoglobin<\/a><\/td><td>MCH<\/td><td>Average amount of hemoglobin per red cell<\/td><td>Often tracks with cell size and hemoglobinization<\/td><td>MCV changes and mixed red-cell populations<\/td><td>A standalone diagnosis<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Mean corpuscular hemoglobin concentration<\/a><\/td><td>MCHC<\/td><td>Average concentration of hemoglobin within red cells<\/td><td>Low can accompany hypochromic patterns; high results may need confirmation<\/td><td>Hemolysis in the tube, lipemia, cold agglutinins, and uncommon red-cell disorders<\/td><td>The exact cause of an abnormality<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Red-cell distribution width<\/a><\/td><td>RDW<\/td><td>Variation in red-cell size<\/td><td>High indicates greater size variability and can support recognition of mixed or evolving patterns<\/td><td>Recent transfusion, recovery from anemia, combined deficiencies, and laboratory method<\/td><td>A specific deficiency or disease<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/white-blood-cell-count-test-with-differential\">White blood cell count<\/a><\/td><td>WBC, leukocyte count<\/td><td>Total number of white cells<\/td><td>High or low values may be reactive, medication-related, infectious, inflammatory, or marrow-related<\/td><td>Recent illness, exercise, stress hormones, smoking, pregnancy, medications, and time of collection<\/td><td>The organism causing an infection or the reason for an abnormal count<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/white-blood-cell-count-test-with-differential\">White blood cell differential<\/a><\/td><td>Diff<\/td><td>Relative and often absolute numbers of neutrophils, lymphocytes, monocytes, eosinophils, and basophils<\/td><td>Shows which cell type contributes to the total WBC pattern<\/td><td>Acute illness, allergies, medications, physiologic stress, and laboratory classification<\/td><td>A diagnosis from one subtype or percentage alone<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Platelet count<\/a><\/td><td>PLT or thrombocyte count<\/td><td>Number of platelets in a volume of blood<\/td><td>Low may increase bleeding concern; high may be reactive or associated with other conditions<\/td><td>Platelet clumping, inflammation, iron deficiency, recent surgery, splenic function, medications, and marrow activity<\/td><td>How well platelets function or the cause of an abnormal count<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Microcytic, Normocytic, and Macrocytic Pattern Matrix<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Educational framework\u2014not a diagnostic or treatment algorithm.<\/strong> MCV organizes an anemia pattern, but mixed conditions can produce an apparently normal MCV. RDW, reticulocytes, iron studies, B12, folate, history, and trends add context.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Pattern<\/th><th class=\"has-text-align-left\" data-align=\"left\">CBC clues<\/th><th class=\"has-text-align-left\" data-align=\"left\">Common categories considered<\/th><th class=\"has-text-align-left\" data-align=\"left\">Tests that may add information<\/th><th class=\"has-text-align-left\" data-align=\"left\">Important limitation<\/th><\/tr><\/thead><tbody><tr><td>Microcytic<\/td><td>MCV below the laboratory interval; MCH may also be low; RDW may be normal or high<\/td><td>Iron-restricted production, inherited hemoglobin traits, and selected chronic or rare conditions<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">Ferritin<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/iron-and-total-iron-binding-capacity-test\">iron\/TIBC and transferrin saturation<\/a>, and clinician-directed hemoglobin evaluation<\/td><td>A low MCV is not synonymous with iron deficiency<\/td><\/tr><tr><td>Normocytic<\/td><td>MCV within the laboratory interval with low hemoglobin or hematocrit<\/td><td>Early iron deficiency, recent blood loss, inflammation, kidney-related reduced production, hemolysis, or marrow conditions<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/reticulocyte-count\">Reticulocyte count<\/a>, iron studies, and targeted organ or hemolysis evaluation<\/td><td>A normal MCV can conceal mixed small- and large-cell populations<\/td><\/tr><tr><td>Macrocytic<\/td><td>MCV above the laboratory interval; RDW may be high<\/td><td>B12 or folate deficiency, medication effects, alcohol exposure, liver or thyroid conditions, reticulocytosis, or marrow disorders<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-b12-test\">Vitamin B12<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/folate-serum-test\">folate<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/methylmalonic-acid-test\">MMA when indicated<\/a>, reticulocytes, and clinician-directed evaluation<\/td><td>Macrocytosis can occur without anemia and does not identify its cause<\/td><\/tr><tr><td>Mixed or evolving<\/td><td>MCV may be within range while RDW is high or the smear shows more than one cell population<\/td><td>Combined deficiencies, recent transfusion, recovery after bleeding or treatment, or more than one process<\/td><td>Review of all indices, prior CBCs, reticulocytes, iron studies, B12, folate, and smear when directed<\/td><td>Averages can hide clinically important subpopulations<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Iron-Study Interpretation Framework<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Educational framework\u2014not a diagnostic or treatment algorithm.<\/strong> The pattern matters more than serum iron alone. Transferrin saturation is generally calculated from serum iron and TIBC, so it inherits some of their biological and analytical variability.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">General pattern<\/th><th class=\"has-text-align-left\" data-align=\"left\">Possible interpretation<\/th><th class=\"has-text-align-left\" data-align=\"left\">Questions for follow-up<\/th><th class=\"has-text-align-left\" data-align=\"left\">What not to conclude<\/th><\/tr><\/thead><tbody><tr><td>Low ferritin, low circulating iron, higher TIBC, and low transferrin saturation<\/td><td>More consistent with depleted iron stores and reduced available iron<\/td><td>Is there bleeding, increased need, insufficient intake, malabsorption, or a recent donation?<\/td><td>Do not assume the cause or begin treatment solely from the pattern<\/td><\/tr><tr><td>Normal or high ferritin with low iron, low or normal TIBC, and low transferrin saturation<\/td><td>May fit inflammation-related iron restriction or a mixed pattern<\/td><td>Was the person acutely ill? Is inflammation, chronic disease, liver disease, or another cause relevant?<\/td><td>Do not use normal or high ferritin to automatically exclude iron deficiency<\/td><\/tr><tr><td>High ferritin with high iron or high transferrin saturation<\/td><td>May raise questions about iron excess, recent supplementation, liver injury, transfusion, or other causes<\/td><td>Was the specimen collected as instructed? Is repeat or inherited-risk evaluation appropriate?<\/td><td>Ferritin elevation alone does not diagnose iron overload<\/td><\/tr><tr><td>Low serum iron alone<\/td><td>Nonspecific; can occur with time-of-day variation, recent illness, inflammation, or true deficiency<\/td><td>What are ferritin, TIBC, transferrin saturation, CBC, and the clinical context?<\/td><td>Do not diagnose iron deficiency from serum iron alone<\/td><\/tr><tr><td>All iron markers within the laboratory's intervals<\/td><td>No obvious biochemical iron pattern on that collection<\/td><td>Are symptoms persistent, was inflammation present, and are other anemia causes or trends relevant?<\/td><td>A normal panel does not guarantee that every cause of fatigue or anemia has been excluded<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Ferritin and Inflammation: Limitations to Know<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Ferritin situation<\/th><th class=\"has-text-align-left\" data-align=\"left\">What it may mean<\/th><th class=\"has-text-align-left\" data-align=\"left\">Why interpretation is limited<\/th><th class=\"has-text-align-left\" data-align=\"left\">Useful context<\/th><\/tr><\/thead><tbody><tr><td>Below the laboratory interval<\/td><td>Usually supports depleted iron stores<\/td><td>The degree of depletion and the cause still require evaluation<\/td><td>CBC, iron\/TIBC, transferrin saturation, bleeding and dietary history<\/td><\/tr><tr><td>Within the laboratory interval<\/td><td>May reflect adequate stores, but not always<\/td><td>Inflammation can raise ferritin and mask depletion<\/td><td>Recent illness, inflammatory conditions, liver context, iron saturation, and trend<\/td><\/tr><tr><td>Above the laboratory interval<\/td><td>May reflect inflammation, infection, liver or metabolic conditions, cell injury, iron excess, or other causes<\/td><td>Ferritin is an acute-phase reactant and is not specific for iron overload<\/td><td>Symptoms, inflammatory context, liver evaluation, iron\/TIBC, transferrin saturation, and repeat testing<\/td><\/tr><tr><td>Changing over time<\/td><td>May reflect changing stores, inflammation, treatment, bleeding, or illness<\/td><td>Different laboratories, collection conditions, and acute events can affect comparability<\/td><td>Use the same laboratory and similar conditions when practical; interpret with the full trend<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Anemia-Testing Selection Pathway<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Educational framework\u2014not a diagnostic or treatment algorithm.<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Check for urgency first.<\/strong> Active bleeding, chest pain, fainting, severe shortness of breath, confusion, rapidly worsening weakness, or a laboratory critical-value alert requires prompt professional or emergency care rather than routine self-directed testing.<\/li>\n\n\n\n<li><strong>Define the question.<\/strong> Is the goal to confirm a prior abnormal CBC, investigate fatigue, assess blood loss, evaluate diet or malabsorption risk, monitor a known condition, or follow a medication?<\/li>\n\n\n\n<li><strong>Start with the cell pattern.<\/strong> Review hemoglobin, hematocrit, RBC count, MCV, MCH, MCHC, RDW, WBC, differential, and platelets from the <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a>.<\/li>\n\n\n\n<li><strong>Use MCV and RDW as organizers.<\/strong> Classify the red-cell pattern as microcytic, normocytic, macrocytic, or mixed, recognizing that averages can hide more than one process.<\/li>\n\n\n\n<li><strong>Assess marrow response when it changes the question.<\/strong> Add a <a href=\"https:\/\/www.ultalabtests.com\/test\/reticulocyte-count\">reticulocyte count<\/a> when distinguishing reduced production from blood loss, destruction, or recovery is clinically relevant.<\/li>\n\n\n\n<li><strong>Order iron studies as a set when iron is the question.<\/strong> Combine <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">ferritin<\/a> with <a href=\"https:\/\/www.ultalabtests.com\/test\/iron-and-total-iron-binding-capacity-test\">iron, TIBC, and transferrin saturation<\/a> rather than diagnosing iron deficiency from serum iron alone.<\/li>\n\n\n\n<li><strong>Use B12 and folate selectively.<\/strong> Consider <a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-b12-test\">B12<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/folate-serum-test\">folate<\/a>, and, when appropriate, <a href=\"https:\/\/www.ultalabtests.com\/test\/methylmalonic-acid-test\">MMA<\/a> when macrocytosis, malabsorption, dietary risk, neurologic symptoms, or medication history provides a reason.<\/li>\n\n\n\n<li><strong>Use hemolysis markers only when the pattern raises the question.<\/strong> Reticulocytes, <a href=\"https:\/\/www.ultalabtests.com\/test\/lactate-dehydrogenase-test\">LDH<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/haptoglobin\">haptoglobin<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/bilirubin-fractionated\">bilirubin<\/a>, and a smear work as a group; none proves hemolysis alone.<\/li>\n\n\n\n<li><strong>Look for the underlying cause.<\/strong> Laboratory results do not locate bleeding, establish dietary intake, identify every inflammatory condition, or replace a medication review, physical examination, imaging, endoscopy, or specialist assessment.<\/li>\n\n\n\n<li><strong>Plan confirmation and follow-up.<\/strong> Repeat unexpected results when appropriate, compare trends under similar conditions, and clarify who will review abnormal findings.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Detailed Tests and Biomarkers<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Red Cells, White Cells, and Platelets<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Test or biomarker<\/th><th class=\"has-text-align-left\" data-align=\"left\">Aliases<\/th><th class=\"has-text-align-left\" data-align=\"left\">Use status<\/th><th class=\"has-text-align-left\" data-align=\"left\">Specimen<\/th><th class=\"has-text-align-left\" data-align=\"left\">What it measures and why it may be ordered<\/th><th class=\"has-text-align-left\" data-align=\"left\">General meaning of abnormal results<\/th><th class=\"has-text-align-left\" data-align=\"left\">Factors and preparation<\/th><th class=\"has-text-align-left\" data-align=\"left\">What it cannot establish by itself<\/th><th class=\"has-text-align-left\" data-align=\"left\">Related subpillar<\/th><th class=\"has-text-align-left\" data-align=\"left\">Ulta Lab Tests page<\/th><th class=\"has-text-align-left\" data-align=\"left\">Primary source<\/th><\/tr><\/thead><tbody><tr><td>Complete blood count<\/td><td>CBC, hemogram<\/td><td>Common or first-line<\/td><td>Whole blood<\/td><td>Measures red cells, hemoglobin, hematocrit, indices, white cells, and platelets; used to identify and monitor blood-cell patterns<\/td><td>High or low components require pattern-based interpretation<\/td><td>Hydration, illness, exercise, pregnancy, medications, transfusion, and specimen quality can alter results<\/td><td>The cause of an abnormal count<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/blog\/anemia\/discover-how-red-blood-cells-and-white-blood-cell-counts-detect-infections-and-immune-issues\/\">Red and White Blood Cell Counts<\/a><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC with Differential and Platelets<\/a><\/td><td><a href=\"https:\/\/medlineplus.gov\/lab-tests\/complete-blood-count-cbc\/\">MedlinePlus: Complete Blood Count<\/a><\/td><\/tr><tr><td>Hemoglobin, hematocrit, and RBC count<\/td><td>Hgb\/Hb, Hct, RBC<\/td><td>Common or first-line<\/td><td>Whole blood<\/td><td>Reflect oxygen-carrying hemoglobin, red-cell volume proportion, and number of red cells<\/td><td>Low values support an anemia pattern; high values may reflect concentration or increased red-cell mass<\/td><td>Hydration, altitude, smoking, pregnancy, bleeding, and transfusion matter<\/td><td>Cause, symptom severity, or treatment need<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/blog\/anemia\/iron-deficiency-anemia\/iron-levels-explained-key-blood-tests-ranges\/\">Iron Levels Explained<\/a><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/red-blood-cell-count-test\">Red Blood Cell Count Test<\/a> and <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a><\/td><td><a href=\"https:\/\/medlineplus.gov\/lab-tests\/complete-blood-count-cbc\/\">MedlinePlus: Complete Blood Count<\/a><\/td><\/tr><tr><td>RBC indices<\/td><td>MCV, MCH, MCHC, RDW<\/td><td>Common or first-line<\/td><td>Whole blood<\/td><td>Describe average size, hemoglobin content, concentration, and size variability of red cells<\/td><td>Organize microcytic, normocytic, macrocytic, and mixed patterns<\/td><td>Mixed deficiencies, transfusion, reticulocytosis, cold agglutinins, specimen issues, and method can affect interpretation<\/td><td>The specific cause of anemia<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/how-to-read-lab-results\/\">How to Read Lab Results<\/a><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC with Differential and Platelets<\/a><\/td><td><a href=\"https:\/\/medlineplus.gov\/lab-tests\/red-blood-cell-rbc-indices\/\">MedlinePlus: RBC Indices<\/a><\/td><\/tr><tr><td>White blood cell count and differential<\/td><td>WBC, leukocytes, differential, ANC<\/td><td>Common or first-line<\/td><td>Whole blood<\/td><td>Counts total white cells and subtypes; used for infection, immune, medication, and marrow-related questions<\/td><td>High or low values can have many reactive or pathologic causes<\/td><td>Illness, physical stress, exercise, smoking, pregnancy, medications, and time of collection can alter counts<\/td><td>The cause of infection or immune symptoms<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/blog\/blood-disorders\/blood-count\/how-to-increase-white-blood-cells\/\">How to Increase White Blood Cells<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/blog\/inflammation\/chronic-inflammation\/eosinophils-blood-test-guide-meaning-levels-high-counts-results-explained\/\">Eosinophils Blood Test Guide<\/a>, and <a href=\"https:\/\/www.ultalabtests.com\/blog\/inflammation\/neutrophil-to-lymphocyte-ratio-in-blood-tests-for-inflammation\/\">Neutrophil-to-Lymphocyte Ratio<\/a><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/white-blood-cell-count-test-with-differential\">White Blood Cell Count with Differential<\/a><\/td><td><a href=\"https:\/\/medlineplus.gov\/lab-tests\/white-blood-count-wbc\/\">MedlinePlus: White Blood Count<\/a><\/td><\/tr><tr><td>Platelet count<\/td><td>PLT, thrombocyte count<\/td><td>Common or first-line<\/td><td>Whole blood<\/td><td>Counts platelets; used in bleeding, clotting, inflammatory, medication, and marrow evaluations<\/td><td>Low counts may increase bleeding concern; high counts may be reactive or associated with other conditions<\/td><td>Platelet clumping, recent surgery, iron deficiency, inflammation, splenic function, and medications can affect the count<\/td><td>Platelet function or the cause of an abnormal count<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/blog\/anemia\/discover-how-red-blood-cells-and-white-blood-cell-counts-detect-infections-and-immune-issues\/\">Red and White Blood Cell Counts<\/a><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC with Differential and Platelets<\/a><\/td><td><a href=\"https:\/\/medlineplus.gov\/lab-tests\/platelet-tests\/\">MedlinePlus: Platelet Tests<\/a><\/td><\/tr><tr><td>Reticulocyte count<\/td><td>Retic count<\/td><td>Risk-based, targeted, or monitoring<\/td><td>Whole blood<\/td><td>Measures young red cells to assess marrow response<\/td><td>Higher values may reflect increased production; lower or inappropriately normal values may indicate limited response<\/td><td>Recent bleeding, hemolysis, transfusion, recovery from deficiency, and treatment timing matter<\/td><td>The cause of altered production or loss<\/td><td><a href=\"#hemolysis-evaluation\">Hemolysis evaluation section<\/a><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/reticulocyte-count\">Reticulocyte Count<\/a><\/td><td><a href=\"https:\/\/medlineplus.gov\/lab-tests\/reticulocyte-count\/\">MedlinePlus: Reticulocyte Count<\/a><\/td><\/tr><tr><td>Peripheral blood smear<\/td><td>Blood film, peripheral smear<\/td><td>Clinician- or laboratory-directed<\/td><td>Whole blood on a slide<\/td><td>Microscopic review of red-cell, white-cell, and platelet appearance<\/td><td>May identify morphology that changes the differential diagnosis<\/td><td>Collection quality, slide preparation, reviewer expertise, and timing affect interpretation<\/td><td>A disease diagnosis by itself<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/how-to-read-lab-results\/\">How to Read Lab Results<\/a><\/td><td>No exact direct-access product was established; clinician or laboratory direction is required.<\/td><td><a href=\"https:\/\/medlineplus.gov\/lab-tests\/blood-smear\/\">MedlinePlus: Blood Smear<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Iron, Vitamin B12, and Folate Tests<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Test or biomarker<\/th><th class=\"has-text-align-left\" data-align=\"left\">Aliases<\/th><th class=\"has-text-align-left\" data-align=\"left\">Use status<\/th><th class=\"has-text-align-left\" data-align=\"left\">Specimen<\/th><th class=\"has-text-align-left\" data-align=\"left\">What it measures and why it may be ordered<\/th><th class=\"has-text-align-left\" data-align=\"left\">General meaning of abnormal results<\/th><th class=\"has-text-align-left\" data-align=\"left\">Factors and preparation<\/th><th class=\"has-text-align-left\" data-align=\"left\">What it cannot establish by itself<\/th><th class=\"has-text-align-left\" data-align=\"left\">Related subpillar<\/th><th class=\"has-text-align-left\" data-align=\"left\">Ulta Lab Tests page<\/th><th class=\"has-text-align-left\" data-align=\"left\">Primary source<\/th><\/tr><\/thead><tbody><tr><td>Ferritin<\/td><td>Serum ferritin<\/td><td>Common or targeted<\/td><td>Serum<\/td><td>Estimates stored iron<\/td><td>Low generally supports depleted stores; high has many iron and non-iron causes<\/td><td>Inflammation, infection, liver conditions, recent illness, iron treatment, and assay context matter<\/td><td>Iron deficiency or iron overload in every context<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/blog\/anemia\/iron-deficiency-anemia\/iron-levels-explained-key-blood-tests-ranges\/\">Iron Levels Explained<\/a><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">Ferritin Test<\/a><\/td><td><a href=\"https:\/\/ods.od.nih.gov\/factsheets\/Iron-HealthProfessional\/\">NIH ODS: Iron Fact Sheet<\/a><\/td><\/tr><tr><td>Serum iron<\/td><td>Iron, total iron<\/td><td>Targeted; usually interpreted with binding capacity and ferritin<\/td><td>Serum<\/td><td>Measures iron circulating on transferrin at the time of collection<\/td><td>Low or high values can result from multiple transient or persistent conditions<\/td><td>Time of day, fasting status, recent iron intake, illness, and specimen handling matter<\/td><td>Iron deficiency from a single result<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/blog\/anemia\/iron-deficiency-anemia\/iron-levels-explained-key-blood-tests-ranges\/\">Iron Levels Explained<\/a><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/iron-total\">Iron Total Test<\/a><\/td><td><a href=\"https:\/\/medlineplus.gov\/lab-tests\/iron-tests\/\">MedlinePlus: Iron Tests<\/a><\/td><\/tr><tr><td>TIBC and transferrin saturation<\/td><td>Total iron-binding capacity, TSAT, percent saturation<\/td><td>Common or targeted<\/td><td>Serum<\/td><td>TIBC estimates available iron-binding capacity; saturation estimates the proportion occupied by iron<\/td><td>Patterns help distinguish depleted stores, inflammation-related restriction, and possible excess<\/td><td>Serum iron variation, nutrition, liver function, inflammation, and collection conditions affect interpretation<\/td><td>A cause without ferritin, CBC, and clinical context<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/blog\/uncategorized\/iron-status-fatigue-brain-fog-recovery-lab-tests\/\">Iron Status and Fatigue<\/a><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/iron-and-total-iron-binding-capacity-test\">Iron and TIBC Test<\/a><\/td><td><a href=\"https:\/\/medlineplus.gov\/lab-tests\/iron-tests\/\">MedlinePlus: Iron Tests<\/a><\/td><\/tr><tr><td>Transferrin<\/td><td>Iron transport protein<\/td><td>Risk-based or targeted<\/td><td>Serum<\/td><td>Measures the principal iron-transport protein<\/td><td>May rise with iron depletion and fall in inflammatory, liver, or nutritional contexts<\/td><td>Inflammation, liver protein synthesis, nutrition, pregnancy, and estrogen exposure matter<\/td><td>Iron deficiency or nutritional status alone<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/blog\/anemia\/iron-deficiency-anemia\/iron-levels-explained-key-blood-tests-ranges\/\">Iron Levels Explained<\/a><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/transferrin-test\">Transferrin Test<\/a><\/td><td><a href=\"https:\/\/ods.od.nih.gov\/factsheets\/Iron-HealthProfessional\/\">NIH ODS: Iron Fact Sheet<\/a><\/td><\/tr><tr><td>Vitamin B12<\/td><td>Cobalamin<\/td><td>Risk-based or targeted<\/td><td>Serum<\/td><td>Assesses circulating B12 in nutrient, neurologic, macrocytic, or malabsorption questions<\/td><td>Low supports deficiency; borderline or apparently normal results may require context<\/td><td>Supplements, injections, binding proteins, liver or kidney conditions, and assay variation can affect results<\/td><td>The cause of low B12 or tissue-level sufficiency in every case<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/blog\/nutrition\/vitamin-nutrient-deficiency-tests\/\">Vitamin and Nutrient Deficiency Tests<\/a><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-b12-test\">Vitamin B12 Test<\/a><\/td><td><a href=\"https:\/\/ods.od.nih.gov\/factsheets\/VitaminB12-HealthProfessional\/\">NIH ODS: Vitamin B12 Fact Sheet<\/a><\/td><\/tr><tr><td>Methylmalonic acid<\/td><td>MMA<\/td><td>Risk-based confirmatory test<\/td><td>Serum<\/td><td>May help clarify a borderline or discordant B12 result<\/td><td>Higher values can support functional B12 deficiency but can also rise with reduced kidney function and age<\/td><td>Kidney function, age, and laboratory method matter<\/td><td>B12 deficiency without clinical and kidney context<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/blog\/nutrition\/vitamin-nutrient-deficiency-tests\/\">Vitamin and Nutrient Deficiency Tests<\/a><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/methylmalonic-acid-test\">Methylmalonic Acid Test<\/a><\/td><td><a href=\"https:\/\/medlineplus.gov\/lab-tests\/methylmalonic-acid-mma-test\/\">MedlinePlus: MMA Test<\/a><\/td><\/tr><tr><td>Folate<\/td><td>Serum folate, vitamin B9<\/td><td>Risk-based or targeted<\/td><td>Serum<\/td><td>Assesses recent folate status in macrocytic or nutritional evaluation<\/td><td>Low may support deficiency; high may reflect recent intake or supplementation<\/td><td>Diet, supplements, pregnancy, medications, recent intake, and assay method can affect results<\/td><td>The cause of macrocytosis or whether B12 deficiency is absent<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/blog\/nutrition\/vitamin-nutrient-deficiency-tests\/\">Vitamin and Nutrient Deficiency Tests<\/a><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/folate-serum-test\">Folate Serum Test<\/a><\/td><td><a href=\"https:\/\/ods.od.nih.gov\/factsheets\/Folate-HealthProfessional\/\">NIH ODS: Folate Fact Sheet<\/a><\/td><\/tr><tr><td>Intrinsic factor blocking antibody<\/td><td>IF antibody<\/td><td>Specialist- or clinician-directed<\/td><td>Serum<\/td><td>Supports evaluation for pernicious anemia when B12 deficiency and clinical context raise the question<\/td><td>A positive result can support the diagnosis; a negative result does not exclude it<\/td><td>Recent B12 treatment, assay limitations, and autoimmune context matter<\/td><td>Pernicious anemia by itself<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/blog\/nutrition\/vitamin-nutrient-deficiency-tests\/\">Vitamin and Nutrient Deficiency Tests<\/a><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/intrinsic-factor-blocking-antibody-test\">Intrinsic Factor Blocking Antibody Test<\/a><\/td><td><a href=\"https:\/\/ods.od.nih.gov\/factsheets\/VitaminB12-HealthProfessional\/\">NIH ODS: Vitamin B12 Fact Sheet<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Markers Used in Hemolysis Evaluation<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Test<\/th><th class=\"has-text-align-left\" data-align=\"left\">Use status<\/th><th class=\"has-text-align-left\" data-align=\"left\">What it adds<\/th><th class=\"has-text-align-left\" data-align=\"left\">General pattern<\/th><th class=\"has-text-align-left\" data-align=\"left\">Key limitations<\/th><th class=\"has-text-align-left\" data-align=\"left\">Ulta Lab Tests page<\/th><th class=\"has-text-align-left\" data-align=\"left\">Primary source<\/th><\/tr><\/thead><tbody><tr><td>Reticulocyte count<\/td><td>Targeted or monitoring<\/td><td>Shows marrow response to red-cell loss or destruction<\/td><td>Often increased when marrow can compensate, but timing and marrow function matter<\/td><td>Not specific for hemolysis<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/reticulocyte-count\">Reticulocyte Count<\/a><\/td><td><a href=\"https:\/\/medlineplus.gov\/lab-tests\/reticulocyte-count\/\">MedlinePlus: Reticulocyte Count<\/a><\/td><\/tr><tr><td>LDH<\/td><td>Clinician-directed<\/td><td>Can rise when cells are damaged<\/td><td>May be elevated in hemolysis<\/td><td>Found in many tissues; hemolyzed specimens, exercise, liver disease, and other tissue injury can raise it<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/lactate-dehydrogenase-test\">Lactate Dehydrogenase Test<\/a><\/td><td><a href=\"https:\/\/medlineplus.gov\/lab-tests\/lactate-dehydrogenase-ldh-test\/\">MedlinePlus: LDH Test<\/a><\/td><\/tr><tr><td>Haptoglobin<\/td><td>Clinician-directed<\/td><td>Measures a protein that binds free hemoglobin<\/td><td>May be low with intravascular red-cell destruction<\/td><td>Inflammation, liver synthesis, kidney disease, blood loss, and other factors can alter it<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/haptoglobin\">Haptoglobin Test<\/a><\/td><td><a href=\"https:\/\/medlineplus.gov\/lab-tests\/haptoglobin-hp-test\/\">MedlinePlus: Haptoglobin Test<\/a><\/td><\/tr><tr><td>Fractionated bilirubin<\/td><td>Clinician-directed<\/td><td>Separates total, direct, and indirect bilirubin<\/td><td>Indirect bilirubin may rise with increased heme breakdown<\/td><td>Liver processing and bile-flow disorders also affect bilirubin<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/bilirubin-fractionated\">Bilirubin Fractionated Test<\/a><\/td><td><a href=\"https:\/\/www.hematology.org\/education\/patients\/anemia\">American Society of Hematology: Anemia<\/a><\/td><\/tr><tr><td>Peripheral smear<\/td><td>Clinician- or laboratory-directed<\/td><td>Shows cell morphology and may identify fragments, shape changes, immature cells, or other clues<\/td><td>Can support or redirect the differential diagnosis<\/td><td>Requires expert review and cannot establish a cause alone<\/td><td>No exact direct-access product was established; clinician or laboratory direction is required.<\/td><td><a href=\"https:\/\/medlineplus.gov\/lab-tests\/blood-smear\/\">MedlinePlus: Blood Smear<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Individual Test Versus Panel Comparison<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Testing option<\/th><th class=\"has-text-align-left\" data-align=\"left\">Typical focus<\/th><th class=\"has-text-align-left\" data-align=\"left\">When it may be useful<\/th><th class=\"has-text-align-left\" data-align=\"left\">Advantages<\/th><th class=\"has-text-align-left\" data-align=\"left\">Limitations<\/th><th class=\"has-text-align-left\" data-align=\"left\">Risk of incidental findings<\/th><th class=\"has-text-align-left\" data-align=\"left\">Questions to ask before ordering<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC with differential and platelets<\/a><\/td><td>All three major blood-cell lines<\/td><td>First evaluation of anemia or abnormal-cell questions; monitoring a known issue<\/td><td>High information density from one specimen<\/td><td>Does not identify the cause of most abnormalities<\/td><td>Moderate because many components are reported<\/td><td>Who will review unexpected WBC or platelet flags?<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">Ferritin alone<\/a><\/td><td>Stored iron<\/td><td>When the question is narrowly about iron stores and other context is already available<\/td><td>Focused and commonly used<\/td><td>Inflammation can make it misleading<\/td><td>Low<\/td><td>Do I also need iron\/TIBC and a CBC to interpret it?<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/iron-and-total-iron-binding-capacity-test\">Iron and TIBC<\/a><\/td><td>Circulating iron, binding capacity, and calculated saturation<\/td><td>When iron availability and transport are relevant<\/td><td>Adds pattern information beyond serum iron<\/td><td>Still needs ferritin, CBC, and clinical context<\/td><td>Low to moderate<\/td><td>Should it be collected in the morning while fasting?<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-iron-and-total-iron-binding-capacity-panel\">Ferritin, Iron, and TIBC Panel<\/a><\/td><td>Stored and circulating iron in one order<\/td><td>When a coherent iron-status pattern is needed<\/td><td>Reduces the risk of interpreting serum iron alone<\/td><td>Does not identify the cause of abnormal iron status<\/td><td>Moderate<\/td><td>Does the current product page include the exact tests I expect?<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-b12-and-folate-panel-test\">Vitamin B12 and Folate Panel<\/a><\/td><td>Two nutrient markers<\/td><td>When macrocytosis or combined nutrient risk is relevant<\/td><td>Convenient paired testing<\/td><td>Borderline B12 can require MMA; supplementation can alter results<\/td><td>Low to moderate<\/td><td>Would testing one nutrient be enough based on my risk?<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/testing\/categories\/anemia\/all-tests\">Broader anemia testing category<\/a><\/td><td>Multiple individual tests and panels<\/td><td>For browsing options after defining the clinical question<\/td><td>Shows available choices<\/td><td>A larger panel may include tests unrelated to the question<\/td><td>Higher as the number of tests grows<\/td><td>What decision will each component change?<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Test-Name and Alias Crosswalk<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Name on report<\/th><th class=\"has-text-align-left\" data-align=\"left\">Common alias or abbreviation<\/th><th class=\"has-text-align-left\" data-align=\"left\">Plain-language meaning<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Complete blood count<\/a><\/td><td>CBC, hemogram<\/td><td>Group of red-cell, white-cell, and platelet measurements<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Hemoglobin<\/a><\/td><td>Hgb, Hb<\/td><td>Oxygen-carrying protein concentration<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Hematocrit<\/a><\/td><td>Hct<\/td><td>Proportion of blood volume made of red cells<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/red-blood-cell-count-test\">Red blood cell count<\/a><\/td><td>RBC, erythrocyte count<\/td><td>Number of red blood cells<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Mean corpuscular volume<\/a><\/td><td>MCV<\/td><td>Average red-cell size<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Mean corpuscular hemoglobin<\/a><\/td><td>MCH<\/td><td>Average hemoglobin amount per red cell<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Mean corpuscular hemoglobin concentration<\/a><\/td><td>MCHC<\/td><td>Average hemoglobin concentration inside red cells<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Red-cell distribution width<\/a><\/td><td>RDW<\/td><td>Variation in red-cell size<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/white-blood-cell-count-test-with-differential\">White blood cell count<\/a><\/td><td>WBC, leukocyte count<\/td><td>Total white-cell number<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/white-blood-cell-count-test-with-differential\">Absolute neutrophil count<\/a><\/td><td>ANC<\/td><td>Absolute number of neutrophils<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Platelet count<\/a><\/td><td>PLT, thrombocyte count<\/td><td>Number of platelets<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/reticulocyte-count\">Reticulocyte count<\/a><\/td><td>Retic<\/td><td>Young red-cell production marker<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">Ferritin<\/a><\/td><td>Serum ferritin<\/td><td>Marker that usually reflects stored iron but can rise with inflammation<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/iron-total\">Serum iron<\/a><\/td><td>Iron, total iron<\/td><td>Iron circulating on transferrin at the time of collection<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/iron-and-total-iron-binding-capacity-test\">Total iron-binding capacity<\/a><\/td><td>TIBC<\/td><td>Estimated available iron-binding capacity<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/iron-and-total-iron-binding-capacity-test\">Transferrin saturation<\/a><\/td><td>TSAT, percent saturation<\/td><td>Percentage of iron-binding sites occupied by iron<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-b12-test\">Vitamin B12<\/a><\/td><td>Cobalamin<\/td><td>Vitamin measured in macrocytic, neurologic, and malabsorption evaluations<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/folate-serum-test\">Folate<\/a><\/td><td>Folic acid, vitamin B9<\/td><td>Vitamin measured in macrocytic and nutritional evaluation<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/lactate-dehydrogenase-test\">Lactate dehydrogenase<\/a><\/td><td>LDH<\/td><td>Nonspecific enzyme that can rise with cell injury<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Preparation and Interference Matrix<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Follow the instructions on the exact Ulta test or panel page because preparation can differ by test, laboratory method, and combination of tests. Never stop a prescription or nonprescription medicine solely to prepare for testing unless the prescribing or supervising professional instructs you to do so.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Factor<\/th><th class=\"has-text-align-left\" data-align=\"left\">Tests commonly affected<\/th><th class=\"has-text-align-left\" data-align=\"left\">How the factor may alter results<\/th><th class=\"has-text-align-left\" data-align=\"left\">General preparation guidance<\/th><th class=\"has-text-align-left\" data-align=\"left\">Important caution<\/th><\/tr><\/thead><tbody><tr><td>Fasting<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/iron-and-total-iron-binding-capacity-test\">Serum iron, TIBC, and transferrin saturation<\/a>; some combined panels<\/td><td>Food and recent iron intake can change circulating iron<\/td><td>Use the exact product instructions; a morning fasting collection may be requested for iron studies<\/td><td>Do not assume every CBC, ferritin, B12, or folate test requires fasting<\/td><\/tr><tr><td>Hydration<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Hemoglobin, hematocrit, and cell counts<\/a><\/td><td>Dehydration can concentrate values; excess fluid can dilute them<\/td><td>Maintain usual hydration unless medically restricted<\/td><td>Fluid shifts can change concentration without changing total body cell mass<\/td><\/tr><tr><td>Time of day<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/iron-total\">Serum iron<\/a>, some white-cell measurements<\/td><td>Circulating iron and some cell counts can vary during the day<\/td><td>Use similar collection times for trend comparisons when practical<\/td><td>A single time-point result may not represent a stable average<\/td><\/tr><tr><td>Recent strenuous exercise<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">WBC and selected CBC components<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/lactate-dehydrogenase-test\">LDH<\/a><\/td><td>Can transiently change white-cell counts, plasma volume, and cell-injury markers<\/td><td>Avoid unusually strenuous activity before testing when the result is intended as a baseline, unless instructed otherwise<\/td><td>Exercise-related changes can mimic or obscure illness-related patterns<\/td><\/tr><tr><td>Recent illness or inflammation<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">Ferritin<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">WBC, differential, platelets, and hemoglobin<\/a><\/td><td>Can raise ferritin, alter white cells and platelets, and change iron availability<\/td><td>Record recent fever, infection, vaccination, surgery, or inflammatory flare for interpretation<\/td><td>Normal or high ferritin during inflammation does not automatically exclude depleted iron stores<\/td><\/tr><tr><td>Menstrual bleeding<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Hemoglobin and hematocrit<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">ferritin<\/a>, iron studies<\/td><td>Ongoing or heavy blood loss can affect red-cell and iron measures<\/td><td>Document bleeding pattern and timing; urgent heavy bleeding needs clinical care<\/td><td>Testing does not identify the gynecologic cause of bleeding<\/td><\/tr><tr><td>Pregnancy<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a>, iron studies, B12, and folate<\/td><td>Plasma-volume expansion and pregnancy-related physiology change interpretation<\/td><td>Use prenatal-clinician guidance and pregnancy-appropriate intervals or thresholds<\/td><td>Direct-access testing should not replace prenatal care<\/td><\/tr><tr><td>Alcohol<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">MCV and platelet count<\/a>, folate, liver-related markers<\/td><td>Can contribute to macrocytosis, nutritional changes, or platelet abnormalities<\/td><td>Report usual and recent intake accurately<\/td><td>Do not infer the cause of macrocytosis from alcohol history alone<\/td><\/tr><tr><td>Smoking or altitude<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Hemoglobin, hematocrit, and RBC count<\/a><\/td><td>Can increase red-cell measures as an adaptation to lower oxygen availability<\/td><td>Include smoking and altitude context when comparing results<\/td><td>A high value may still require evaluation<\/td><\/tr><tr><td>Biotin<\/td><td>Some immunoassays, depending on laboratory platform<\/td><td>Can cause falsely high or low results in susceptible assays<\/td><td>Tell the laboratory and healthcare professional about biotin-containing supplements and follow current test instructions<\/td><td>Do not stop a prescribed supplement without professional guidance<\/td><\/tr><tr><td>Iron, B12, folate, multivitamins, and fortified foods<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/iron-total\">Serum iron<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">ferritin<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-b12-test\">B12<\/a>, and <a href=\"https:\/\/www.ultalabtests.com\/test\/folate-serum-test\">folate<\/a><\/td><td>Recent intake or treatment can alter circulating or stored-marker results<\/td><td>Record product, dose, route, and timing for interpretation<\/td><td>Do not use testing to self-adjust treatment doses<\/td><\/tr><tr><td>Prescription and nonprescription medicines<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a>, B12, folate, iron studies, and marrow-response tests<\/td><td>Some medicines affect cell production, cell survival, absorption, or assay performance<\/td><td>Provide a complete medication list<\/td><td>Never stop or change a medicine for testing without guidance<\/td><\/tr><tr><td>Transfusion or recent blood loss<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC and RBC indices<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/reticulocyte-count\">reticulocytes<\/a>, iron studies, smear<\/td><td>Can create mixed cell populations and change trends<\/td><td>Record dates and circumstances<\/td><td>Post-transfusion results may not represent the patient's baseline<\/td><\/tr><tr><td>Specimen handling<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/lactate-dehydrogenase-test\">LDH<\/a>, potassium, CBC morphology, and platelet count<\/td><td>Hemolysis in the tube can raise LDH; platelet clumping can falsely lower platelets; delays can alter cell morphology<\/td><td>Use an appropriate collection site and follow laboratory handling requirements<\/td><td>Unexpected or internally inconsistent results may need recollection<\/td><\/tr><tr><td>Laboratory methodology<\/td><td>All tests<\/td><td>Instrument, reagent, calibration, and reference-population differences can affect values and intervals<\/td><td>Compare trends from the same laboratory and method when practical<\/td><td>Do not compare numbers without checking units and intervals<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Understand Your CBC and Anemia Test Results<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Start with the laboratory's units and reference interval, then interpret the related results together. A flag means a result is outside that laboratory's interval; it does not automatically establish disease. A result within the interval does not guarantee that no problem exists. Age, sex, pregnancy, altitude, hydration, recent illness, medications, and assay method can change interpretation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Reference intervals are not the same as diagnostic thresholds, screening cutoffs, or treatment targets. A diagnostic decision may use several results and clinical criteria. A treatment target may be selected for a known condition. A monitoring target may focus on direction and stability rather than whether every value is inside the general reference interval.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trends often add context. A hemoglobin value that is technically within range but falling over time may deserve attention; a mildly flagged value that has been stable for years may carry a different question. Review prior results, collection conditions, symptoms, and the reason for testing. For a deeper explanation of units, flags, biological variation, and discordant results, use <a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/how-to-read-lab-results\/\">How to Read and Understand Your Lab Results<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Reference Interval Versus Decision Threshold<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Term<\/th><th class=\"has-text-align-left\" data-align=\"left\">What it means<\/th><th class=\"has-text-align-left\" data-align=\"left\">How it is established<\/th><th class=\"has-text-align-left\" data-align=\"left\">How it is used<\/th><th class=\"has-text-align-left\" data-align=\"left\">Why it may differ<\/th><th class=\"has-text-align-left\" data-align=\"left\">Patient caution<\/th><\/tr><\/thead><tbody><tr><td>Laboratory reference interval<\/td><td>Range expected for most people in a defined reference population using a specific method<\/td><td>Population and analytical studies<\/td><td>Flags results for review<\/td><td>Population, instrument, method, age, sex, pregnancy, altitude, and units<\/td><td>Inside range does not guarantee health; outside range does not prove disease<\/td><\/tr><tr><td>Diagnostic threshold<\/td><td>A value or criterion used with other information to support a diagnosis<\/td><td>Guidelines, outcomes data, and expert consensus<\/td><td>Helps classify a condition in a defined context<\/td><td>Population, pregnancy, age, comorbidities, and guideline<\/td><td>Do not self-diagnose from one value<\/td><\/tr><tr><td>Screening cutoff<\/td><td>A threshold chosen to identify people who may need more evaluation<\/td><td>Balance of sensitivity, specificity, prevalence, and consequences<\/td><td>Triggers follow-up rather than proving disease<\/td><td>Purpose and population<\/td><td>False-positive and false-negative results occur<\/td><\/tr><tr><td>Treatment target<\/td><td>A goal used after a condition and plan are established<\/td><td>Clinical evidence and guideline recommendations<\/td><td>Guides treatment monitoring<\/td><td>Condition, treatment, symptoms, safety, and clinician judgment<\/td><td>Not interchangeable with the general laboratory interval<\/td><\/tr><tr><td>Monitoring target<\/td><td>A desired trend, stability range, or safety limit during follow-up<\/td><td>Condition-specific evidence and individualized care plan<\/td><td>Assesses response or safety<\/td><td>Timing, baseline, treatment, and clinical goals<\/td><td>A single result may not show the full response<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Fictional CBC and Iron-Report Walkthrough<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Educational example only. This is not a diagnosis, not a universal reference range, and not a treatment recommendation.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Test<\/th><th class=\"has-text-align-left\" data-align=\"left\">Fictional value<\/th><th class=\"has-text-align-left\" data-align=\"left\">Unit<\/th><th class=\"has-text-align-left\" data-align=\"left\">Sample laboratory flag<\/th><th class=\"has-text-align-left\" data-align=\"left\">Related result<\/th><th class=\"has-text-align-left\" data-align=\"left\">Question raised<\/th><\/tr><\/thead><tbody><tr><td>Hemoglobin<\/td><td>Below this sample laboratory's interval<\/td><td>g\/dL<\/td><td>Low<\/td><td>Hematocrit also low<\/td><td>Is an anemia pattern present, and how severe is it clinically?<\/td><\/tr><tr><td>MCV<\/td><td>Below this sample laboratory's interval<\/td><td>fL<\/td><td>Low<\/td><td>MCH low<\/td><td>What is causing the microcytic pattern?<\/td><\/tr><tr><td>RDW<\/td><td>Above this sample laboratory's interval<\/td><td>%<\/td><td>High<\/td><td>Red-cell size variation noted<\/td><td>Is the pattern evolving or mixed?<\/td><\/tr><tr><td>Platelet count<\/td><td>Mildly above this sample laboratory's interval<\/td><td>cells per volume<\/td><td>High<\/td><td>WBC unflagged<\/td><td>Could this be reactive, including from iron depletion or inflammation?<\/td><\/tr><tr><td>Ferritin<\/td><td>Below this sample laboratory's interval<\/td><td>ng\/mL<\/td><td>Low<\/td><td>Serum iron low<\/td><td>Are iron stores depleted?<\/td><\/tr><tr><td>TIBC<\/td><td>Above this sample laboratory's interval<\/td><td>mcg\/dL<\/td><td>High<\/td><td>Transferrin saturation low<\/td><td>Does the combined iron pattern support reduced iron availability?<\/td><\/tr><tr><td>Reticulocyte count<\/td><td>Not increased for the degree of anemia<\/td><td>% or absolute count<\/td><td>Context-dependent<\/td><td>Hemoglobin low<\/td><td>Is marrow production responding appropriately?<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How to read the pattern:<\/strong> The low hemoglobin establishes that this fictional report has an anemia pattern. Low MCV organizes it as microcytic, while high RDW suggests greater variation in red-cell size. Low ferritin plus low iron, high TIBC, and low transferrin saturation is more consistent with depleted iron stores than serum iron alone. The platelet elevation could be reactive, but it cannot be assumed to be benign. The reticulocyte result adds information about marrow response.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Professional follow-up questions:<\/strong> Is there heavy menstrual bleeding, gastrointestinal blood loss, frequent blood donation, pregnancy, recent surgery, reduced iron intake, malabsorption, inflammation, or another explanation? Does the person have chest pain, fainting, severe shortness of breath, rapid pulse, or active bleeding? Should the CBC and iron studies be repeated, and what evaluation is needed to identify the cause?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">When Not to Order a Test<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Do not order serum iron alone to diagnose iron deficiency.<\/strong> It varies with time of day, recent intake, illness, and inflammation. Ferritin, TIBC, transferrin saturation, CBC findings, and clinical context provide a more useful pattern.<\/li>\n\n\n\n<li><strong>Do not use a broad hemolysis workup as a routine wellness screen.<\/strong> <a href=\"https:\/\/www.ultalabtests.com\/test\/lactate-dehydrogenase-test\">LDH<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/haptoglobin\">haptoglobin<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/bilirubin-fractionated\">bilirubin<\/a>, reticulocytes, and smear review are most useful when history or a CBC pattern raises concern for red-cell destruction.<\/li>\n\n\n\n<li><strong>Do not order a peripheral smear without a plan for expert interpretation.<\/strong> Morphology requires clinician or laboratory review and may trigger additional evaluation.<\/li>\n\n\n\n<li><strong>Do not assume more tests are automatically better.<\/strong> Large panels can produce incidental abnormalities, false alarms, repeat testing, cost, anxiety, or unnecessary specialist referrals.<\/li>\n\n\n\n<li><strong>Do not repeat a test too soon to answer a trend question.<\/strong> The useful interval depends on the biological process, treatment, severity, and purpose.<\/li>\n\n\n\n<li><strong>Do not use routine outpatient testing for severe or rapidly worsening symptoms.<\/strong> Active bleeding, chest pain, fainting, severe shortness of breath, confusion, or a critical-value alert needs prompt care.<\/li>\n\n\n\n<li><strong>Do not use blood testing to locate bleeding.<\/strong> Examination, gynecologic evaluation, stool studies, endoscopy, imaging, or another procedure may be more appropriate.<\/li>\n\n\n\n<li><strong>Do not use one normal result to dismiss persistent symptoms.<\/strong> A normal CBC does not exclude every cause of fatigue, infection symptoms, bruising, or neurologic concerns.<\/li>\n\n\n\n<li><strong>Do not change iron, B12, folate, or medication doses from this article.<\/strong> Treatment requires an individualized diagnosis, contraindication review, and follow-up plan.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">When Repeat or Confirmatory Testing May Be Needed<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Repeat or confirmatory testing may be reasonable when a result is unexpected, inconsistent with related results, obtained during acute illness, affected by collection or specimen quality, or important enough that a false-positive or false-negative result would change care.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>An unexpected platelet count may be repeated if platelet clumping or a specimen issue is suspected.<\/li>\n\n\n\n<li>A new WBC abnormality may be repeated after recovery from an acute illness, depending on severity and symptoms.<\/li>\n\n\n\n<li>A borderline B12 result may be clarified with <a href=\"https:\/\/www.ultalabtests.com\/test\/methylmalonic-acid-test\">methylmalonic acid<\/a> when clinically appropriate.<\/li>\n\n\n\n<li>A ferritin result that conflicts with the CBC and transferrin saturation may need interpretation in the context of inflammation and a repeat under more stable conditions.<\/li>\n\n\n\n<li>A suspected hemolysis pattern may require reticulocytes, LDH, haptoglobin, fractionated bilirubin, smear review, and condition-specific tests selected by a clinician.<\/li>\n\n\n\n<li>A persistent unexplained abnormality in more than one blood-cell line may require hematology evaluation rather than repeated broad self-directed panels.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">When comparing results over time, use the same laboratory and similar collection conditions when practical. Confirm units, methods, and reference intervals before deciding that a value has meaningfully changed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">When Abnormal White Cells or Platelets Require Prompt Evaluation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">White-cell and platelet abnormalities range from temporary reactive changes to findings that need urgent evaluation. The reporting laboratory may directly contact the ordering professional or patient when a result meets its critical-value policy. Follow that instruction immediately.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Finding or symptom<\/th><th class=\"has-text-align-left\" data-align=\"left\">Why prompt evaluation matters<\/th><th class=\"has-text-align-left\" data-align=\"left\">Appropriate next step<\/th><\/tr><\/thead><tbody><tr><td>Fever or signs of infection with a known or suspected very low neutrophil count<\/td><td>The body's ability to contain infection may be impaired<\/td><td>Seek urgent medical guidance; emergency evaluation may be required<\/td><\/tr><tr><td>Uncontrolled bleeding, widespread petechiae, blood in vomit or stool, or severe menstrual bleeding with a low platelet count<\/td><td>Bleeding risk may be significant<\/td><td>Seek urgent or emergency care<\/td><\/tr><tr><td>Severe headache, confusion, weakness on one side, vision change, or other neurologic symptoms with a platelet abnormality<\/td><td>Neurologic symptoms can signal a time-sensitive complication<\/td><td>Call emergency services<\/td><\/tr><tr><td>Very high WBC or platelet results accompanied by chest pain, shortness of breath, severe headache, vision change, or neurologic symptoms<\/td><td>Marked abnormalities with symptoms can require rapid assessment<\/td><td>Seek emergency evaluation<\/td><\/tr><tr><td>Immature, abnormal, or unclassified cells reported; abnormalities in two or three cell lines; or a persistent unexplained trend<\/td><td>The pattern may require smear review, repeat testing, or specialist evaluation<\/td><td>Arrange prompt clinician review; timing depends on severity and symptoms<\/td><\/tr><tr><td>A laboratory critical-value notice<\/td><td>The result met that laboratory's urgent-notification policy<\/td><td>Follow the laboratory or ordering professional's instructions immediately<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Because critical thresholds depend on the analyte, method, patient, and clinical situation, this page does not provide one universal emergency number for WBC or platelet counts.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">When Professional or Urgent Care Is Needed<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Arrange prompt professional evaluation for marked anemia symptoms, rapidly worsening fatigue, unexplained persistent CBC abnormalities, suspected blood loss, recurrent infections, jaundice, dark urine, new neurologic symptoms, or abnormal counts involving more than one blood-cell line.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Call 911 or seek emergency care for chest pain, fainting, severe shortness of breath, confusion, uncontrolled or active heavy bleeding, vomiting blood, black or bloody stools with weakness or dizziness, severe neurologic symptoms, or any rapidly worsening potentially life-threatening symptom.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Explore Related Health Areas<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/nutrition\/vitamin-nutrient-deficiency-tests\/\">Vitamin and Nutrient Deficiency Tests<\/a> for broader nutrient-status questions.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/digestive-system\/digestive-health-lab-tests\/\">Digestive Health Lab Tests<\/a> for malabsorption and gastrointestinal blood-loss context.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/kidney\/kidney-health\/kidney-function-tests\/\">Kidney Function Tests<\/a> for kidney-related contributors to anemia.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/cancer\/cancer-blood-tests-and-tumor-markers-uses-limitations-and-follow-upcancer-blood-tests-tumor-markers\/\">Cancer Blood Tests and Tumor Markers<\/a> for cancer-testing uses, limitations, and follow-up.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Related Individual Tests and Panels<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Choose tests based on the question being asked. A product link identifies an available test or panel; it does not mean that the test is appropriate for every reader. Public search results corroborated the routes below on August 7, 2026, but direct product-page access could not be completed in this environment. Before publication, an authorized reviewer must confirm each live title, specimen, preparation instructions, availability, and panel contents.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">CBC and Blood-Cell Tests<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Complete Blood Count with Differential and Platelets<\/a> - measures red-cell, white-cell, differential, and platelet parameters.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/cbc-test-with-h-h-rbc-indices-wbc-and-plt\">CBC Test with H\/H, RBC, Indices, WBC and Platelets<\/a> - provides a focused CBC without implying that MCV, MCH, MCHC, or RDW are separate products.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobin-and-hematocrit-test\">Hemoglobin and Hematocrit Test<\/a> - combines hemoglobin and hematocrit measurements.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/red-blood-cell-count-test\">Red Blood Cell Count Test<\/a> - measures the red blood cell count.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/white-blood-cell-count-wbc\">White Blood Cell Count Test<\/a> - measures the total white blood cell count.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/white-blood-cell-count-test-with-differential\">WBC Count with Differential<\/a> - reports the total white-cell count and differential.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobin-hgb\">Hemoglobin Test<\/a> - measures hemoglobin as an individual test.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/hematocrit-hct\">Hematocrit Test<\/a> - measures hematocrit as an individual test and is distinct from the combined H&amp;H product.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/platelet-count-edta\">Platelet Count Test<\/a> - measures the platelet count.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/reticulocyte-count\">Reticulocyte Count Test<\/a> - helps assess the marrow response to a red-cell problem.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Iron-Status Tests<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">Ferritin Test<\/a> - estimates stored iron but must be interpreted with inflammatory context.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/iron-total\">Iron, Total Test<\/a> - measures circulating iron and should not be interpreted alone.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/iron-and-total-iron-binding-capacity-test\">Iron and Total Iron-Binding Capacity Test<\/a> - assesses circulating iron, binding capacity, and calculated saturation.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/transferrin-test\">Transferrin Test<\/a> - measures the principal iron-transport protein.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/soluble-transferrin-receptor\">Soluble Transferrin Receptor Test<\/a> - may add information in selected iron-status questions.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Vitamin B12 and Folate Tests<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-b12-test\">Vitamin B12 Test<\/a> - evaluates circulating vitamin B12.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/folate-serum-test\">Folate, Serum Test<\/a> - supports selected macrocytic and nutritional evaluations.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/folate-rbc-test\">Folate, RBC Test<\/a> - measures red-cell folate for selected clinical questions.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/methylmalonic-acid-test\">Methylmalonic Acid Test<\/a> - may help clarify a borderline or discordant vitamin B12 result.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/homocysteine-test\">Homocysteine Test<\/a> - may add context in selected vitamin B12 or folate evaluations but is not specific to one deficiency.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/intrinsic-factor-blocking-antibody-test\">Intrinsic Factor Blocking Antibody Test<\/a> - is used in clinician-directed evaluation when pernicious anemia is suspected.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Hemolysis and Hemoglobin Evaluation<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/lactate-dehydrogenase-test\">Lactate Dehydrogenase Test<\/a> - is a nonspecific cell-injury marker that can support, but not prove, a hemolysis pattern.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/haptoglobin\">Haptoglobin Test<\/a> - may be low with intravascular red-cell destruction but is affected by inflammation and liver protein synthesis.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/bilirubin-fractionated\">Bilirubin, Fractionated Test<\/a> - separates direct and indirect bilirubin.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/direct-antiglobulin-test-dat\">Direct Antiglobulin Test (DAT)<\/a> - supports clinician-directed evaluation of immune-mediated red-cell destruction.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/direct-antiglobulin-test-with-reflex-to-anti-c3-and-anti-igg\">Direct Antiglobulin Test with Reflex to Anti-C3 and Anti-IgG<\/a> - adds reflex testing when the initial result meets the laboratory criteria.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">Hemoglobinopathy Evaluation<\/a> - supports selected evaluation of hemoglobin variants and inherited patterns.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Selected Context Tests<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/c-reactive-protein-test\">C-Reactive Protein Test<\/a> - may provide inflammatory context when ferritin and iron findings are discordant.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/sed-rate-test\">Sed Rate Test<\/a> - is a nonspecific inflammation marker and does not identify an anemia cause by itself.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/celiac-disease-comprehensive-panel\">Celiac Disease Comprehensive Panel<\/a> - may be relevant when malabsorption is a clinician-directed concern.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/urinalysis-ua-complete\">Urinalysis, Complete<\/a> - may add nonblood context in selected evaluations.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/a1c-test\">A1c Test<\/a> - measures glycated hemoglobin for diabetes-related questions and is not an anemia test; some red-cell conditions can complicate interpretation.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Focused Panels<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-iron-and-total-iron-binding-capacity-panel\">Ferritin, Iron, and Total Iron-Binding Capacity Panel<\/a> - combines stored-iron and circulating-iron measures.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-b12-and-folate-panel-test\">Vitamin B12 and Folate Panel<\/a> - pairs two nutrient markers for selected evaluations.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/anemia-health-basic\">Anemia Health - Basic<\/a> - a named Ulta panel whose live component list must be confirmed before publication.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/anemia-health-basic-plus\">Anemia Health - Basic Plus<\/a> - a named Ulta panel whose live component list must be confirmed before publication.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/anemia-health-advanced\">Anemia Health - Advanced<\/a> - a named Ulta panel whose live component list must be confirmed before publication.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/anemia-health-comprehensive\">Anemia Health - Comprehensive<\/a> - a named Ulta panel whose live component list must be confirmed before publication.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Panel naming caution:<\/strong> Basic, Basic Plus, Advanced, and Comprehensive are product labels, not automatic quality rankings. Confirm the live panel contents and preparation instructions before choosing or publishing any panel.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Browse the current <a href=\"https:\/\/www.ultalabtests.com\/testing\/categories\/anemia\">Anemia Tests category<\/a> for the live category view.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Ulta Lab Tests May Help<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Eligible patients can review available laboratory tests and current pricing online, follow the preparation and collection instructions shown for the selected test, and access results through their account. Direct-access testing can support a more informed conversation with a healthcare professional, but it does not replace examination, diagnosis, treatment planning, urgent care, or specialist evaluation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before ordering, use <a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/direct-access-lab-testing\/\">Direct-Access Lab Testing: How It Works and What to Expect<\/a> to understand test selection, preparation, collection, result review, and follow-up. You can also review <a href=\"https:\/\/www.ultalabtests.com\/how-it-works\">How Ulta Lab Tests Works<\/a> for the current ordering process.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Questions to Ask a Healthcare Professional<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Which CBC component is abnormal, and is the change new, persistent, or worsening?<\/li>\n\n\n\n<li>Does my MCV and RDW pattern suggest that iron, B12, folate, reticulocytes, or another test would add information?<\/li>\n\n\n\n<li>Could recent illness, inflammation, dehydration, exercise, pregnancy, altitude, smoking, medication, or transfusion have affected my result?<\/li>\n\n\n\n<li>Should ferritin be interpreted with iron, TIBC, transferrin saturation, and an inflammatory or liver context?<\/li>\n\n\n\n<li>Could I be losing blood, and what evaluation is needed to identify the source?<\/li>\n\n\n\n<li>Would a reticulocyte count help determine whether my marrow is responding?<\/li>\n\n\n\n<li>If B12 is borderline, would methylmalonic acid add useful information?<\/li>\n\n\n\n<li>Are LDH, haptoglobin, bilirubin, or a peripheral smear appropriate, or would they be unnecessary?<\/li>\n\n\n\n<li>Does the WBC differential show an abnormal absolute count or only an abnormal percentage?<\/li>\n\n\n\n<li>Could platelet clumping or another specimen issue explain the platelet result?<\/li>\n\n\n\n<li>When should the test be repeated, and should I use the same laboratory and collection conditions?<\/li>\n\n\n\n<li>What symptoms or result changes should prompt urgent or emergency care?<\/li>\n\n\n\n<li>Do I need a hematology, gastroenterology, gynecology, nutrition, kidney, liver, or other specialist evaluation?<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What is the main blood test for anemia?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC with differential and platelets<\/a> is usually the central starting test because it reports hemoglobin, hematocrit, red-cell count, MCV, MCH, MCHC, RDW, white cells, and platelets. Follow-up testing depends on the pattern and the clinical question.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can a CBC tell whether I have iron deficiency?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A CBC can show a pattern that raises the question, such as low hemoglobin with a low MCV, but it cannot establish iron deficiency by itself. <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">Ferritin<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/iron-and-total-iron-binding-capacity-test\">iron\/TIBC<\/a>, transferrin saturation, history, and inflammatory context add information.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is low serum iron enough to diagnose iron deficiency?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. Serum iron changes with time of day, recent intake, illness, and inflammation. It should be interpreted with ferritin, TIBC, transferrin saturation, CBC findings, and the reason for testing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can ferritin be high even when iron availability is low?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. Ferritin is an acute-phase reactant and can rise with inflammation, infection, liver conditions, cell injury, and other processes. A normal or high ferritin result may therefore need to be interpreted with transferrin saturation, TIBC, CBC findings, and the clinical context.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What does a low MCV mean?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A low MCV describes a microcytic red-cell pattern. Iron-restricted production is one possible category, but inherited hemoglobin traits and other conditions can also produce microcytosis. MCV organizes the evaluation; it does not identify the cause.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What does a high MCV mean?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A high MCV describes a macrocytic pattern. Vitamin B12 or folate deficiency, medications, alcohol exposure, liver or thyroid conditions, increased reticulocytes, and marrow disorders are among the categories considered. A high MCV is not a diagnosis.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What does RDW add to a CBC?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">RDW describes variation in red-cell size. A high RDW may occur in an evolving or mixed pattern, after transfusion, or during recovery. It is most useful when interpreted with MCV, hemoglobin, prior results, and other tests.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why is a reticulocyte count ordered?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A <a href=\"https:\/\/www.ultalabtests.com\/test\/reticulocyte-count\">reticulocyte count<\/a> helps assess whether bone marrow is releasing young red cells. It can help organize questions about reduced production, blood loss, red-cell destruction, or recovery, but it does not identify the cause by itself.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Do I need both vitamin B12 and folate testing?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Not always. The choice depends on MCV, diet, malabsorption risk, pregnancy, medications, neurologic symptoms, and prior results. A <a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-b12-and-folate-panel-test\">B12 and folate panel<\/a> may be convenient when both questions are relevant, but a focused individual test may be enough in some situations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is the difference between WBC percentage and absolute count?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A percentage shows the share of white cells represented by a subtype; an absolute count estimates the actual number in a volume of blood. Percentages can look abnormal merely because another subtype changed, so absolute counts often provide more useful context.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can a high platelet count be related to iron deficiency?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Iron-depleted states can be associated with a reactive platelet increase, but infection, inflammation, surgery, tissue injury, medications, splenic factors, and marrow conditions can also raise platelets. The count and trend require clinical context.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Should I fast for a CBC or ferritin test?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Fasting is usually not required solely for a CBC and is often not required for ferritin, but the instructions depend on the exact test combination. Iron\/TIBC testing may request a morning fasting collection. Always follow the current product-page instructions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can dehydration change a CBC?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. Dehydration can concentrate hemoglobin, hematocrit, and cell counts, while excess fluid can dilute them. This changes measured concentrations and may not reflect a true change in total body cell mass.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">When is a peripheral blood smear useful?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A smear is useful when automated counts or clinical findings require microscopic review of cell appearance. It is clinician- or laboratory-directed and should be interpreted by qualified professionals rather than used as a general wellness screen.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">When should abnormal CBC results be treated as urgent?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Urgency depends on severity, symptoms, trend, comorbidities, active bleeding, and the laboratory's critical-value policy. Chest pain, fainting, severe shortness of breath, confusion, uncontrolled bleeding, severe neurologic symptoms, or fever with a very low neutrophil count requires prompt or emergency care.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Main Takeaways About CBC and Anemia Blood Tests<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">CBC and anemia blood tests cover red cells, white cells, platelets, iron status, nutrient-related contributors, marrow response, and selected markers of red-cell destruction. The CBC establishes the blood-cell pattern; ferritin and iron studies clarify iron questions; B12 and folate address selected nutrient risks; reticulocytes assess marrow response; and LDH, haptoglobin, bilirubin, and a smear are used selectively when hemolysis or abnormal morphology is suspected.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Focused testing may narrow the next question, but it cannot identify every cause, locate bleeding, replace examination or procedures, or determine treatment from one result. Interpret related values together, review collection conditions and trends, and seek professional care for marked symptoms or very abnormal counts. Use <a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/how-to-read-lab-results\/\">How to Read and Understand Your Lab Results<\/a> for interpretation principles and <a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/direct-access-lab-testing\/\">Direct-Access Lab Testing: How It Works and What to Expect<\/a> for responsible ordering and follow-up. Explore the focused iron, nutrient, red-cell, white-cell, eosinophil, and NLR guides above for deeper answers.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Primary References<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.hematology.org\/education\/patients\/anemia\">Anemia<\/a>. American Society of Hematology. Accessed August 7, 2026. Supports general definitions, symptoms, and the need to determine the cause.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.hematology.org\/education\/patients\/blood-basics\">Blood Basics<\/a>. American Society of Hematology. Accessed August 7, 2026. Supports the roles of red cells, white cells, platelets, plasma, and marrow.<\/li>\n\n\n\n<li><a href=\"https:\/\/medlineplus.gov\/lab-tests\/complete-blood-count-cbc\/\">Complete Blood Count (CBC)<\/a>. MedlinePlus, U.S. National Library of Medicine. Accessed August 7, 2026. Supports CBC components, uses, preparation, and limitations.<\/li>\n\n\n\n<li><a href=\"https:\/\/medlineplus.gov\/lab-tests\/red-blood-cell-rbc-indices\/\">Red Blood Cell Indices<\/a>. MedlinePlus, U.S. National Library of Medicine. Accessed August 7, 2026. Supports MCV, MCH, MCHC, and RDW interpretation.<\/li>\n\n\n\n<li><a href=\"https:\/\/medlineplus.gov\/lab-tests\/iron-tests\/\">Iron Tests<\/a>. MedlinePlus, U.S. National Library of Medicine. Accessed August 7, 2026. Supports serum iron, transferrin, TIBC, and percent-saturation concepts.<\/li>\n\n\n\n<li><a href=\"https:\/\/medlineplus.gov\/lab-tests\/ferritin-blood-test\/\">Ferritin Blood Test<\/a>. MedlinePlus, U.S. National Library of Medicine. Accessed August 7, 2026. Supports ferritin as an iron-storage marker and its limitations.<\/li>\n\n\n\n<li><a href=\"https:\/\/ods.od.nih.gov\/factsheets\/Iron-HealthProfessional\/\">Iron: Fact Sheet for Health Professionals<\/a>. NIH Office of Dietary Supplements. Accessed August 7, 2026. Supports iron physiology, deficiency context, and biomarker limitations.<\/li>\n\n\n\n<li><a href=\"https:\/\/ods.od.nih.gov\/factsheets\/VitaminB12-HealthProfessional\/\">Vitamin B12: Fact Sheet for Health Professionals<\/a>. NIH Office of Dietary Supplements. Accessed August 7, 2026. Supports vitamin B12 status, risk factors, macrocytic and neurologic context, and MMA use.<\/li>\n\n\n\n<li><a href=\"https:\/\/ods.od.nih.gov\/factsheets\/Folate-HealthProfessional\/\">Folate: Fact Sheet for Health Professionals<\/a>. NIH Office of Dietary Supplements. Accessed August 7, 2026. Supports folate physiology, deficiency context, and testing limitations.<\/li>\n\n\n\n<li><a href=\"https:\/\/medlineplus.gov\/lab-tests\/reticulocyte-count\/\">Reticulocyte Count<\/a>. MedlinePlus, U.S. National Library of Medicine. Accessed August 7, 2026. Supports marrow-response interpretation.<\/li>\n\n\n\n<li><a href=\"https:\/\/medlineplus.gov\/lab-tests\/haptoglobin-hp-test\/\">Haptoglobin Test<\/a>. MedlinePlus, U.S. National Library of Medicine. Accessed August 7, 2026. Supports use and limitations in hemolysis evaluation.<\/li>\n\n\n\n<li><a href=\"https:\/\/medlineplus.gov\/lab-tests\/lactate-dehydrogenase-ldh-test\/\">Lactate Dehydrogenase (LDH) Test<\/a>. MedlinePlus, U.S. National Library of Medicine. Accessed August 7, 2026. Supports LDH as a nonspecific cell-injury marker.<\/li>\n\n\n\n<li><a href=\"https:\/\/medlineplus.gov\/lab-tests\/blood-smear\/\">Blood Smear<\/a>. MedlinePlus, U.S. National Library of Medicine. Accessed August 7, 2026. Supports microscopic morphology review and its role.<\/li>\n\n\n\n<li><a href=\"https:\/\/medlineplus.gov\/lab-tests\/white-blood-count-wbc\/\">White Blood Count<\/a>. MedlinePlus, U.S. National Library of Medicine. Accessed August 7, 2026. Supports WBC uses and broad causes of high or low counts.<\/li>\n\n\n\n<li><a href=\"https:\/\/medlineplus.gov\/lab-tests\/platelet-tests\/\">Platelet Tests<\/a>. MedlinePlus, U.S. National Library of Medicine. Accessed August 7, 2026. Supports platelet-count uses and limitations.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.fda.gov\/regulatory-information\/search-fda-guidance-documents\/testing-biotin-interference-in-vitro-diagnostic-devices\">Testing for Biotin Interference in In Vitro Diagnostic Devices<\/a>. U.S. Food and Drug Administration. Accessed August 7, 2026. Supports the warning that biotin can interfere with susceptible assays.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.who.int\/news-room\/fact-sheets\/detail\/anaemia\">Anaemia Fact Sheet<\/a>. World Health Organization. Accessed August 7, 2026. Supports the public-health importance and broad causes of anemia.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.who.int\/publications\/i\/item\/9789240088542\">Guideline on Haemoglobin Cutoffs to Define Anaemia in Individuals and Populations<\/a>. World Health Organization. Published March 5, 2024; accessed August 7, 2026. Supports population- and life-stage-specific hemoglobin cutoffs.<\/li>\n<\/ol>\n\n\n\n<h2 id=\"h-editorial-disclosure-authorship-and-medical-note\" class=\"wp-block-heading\"><strong>Editorial Disclosure, Authorship, and Medical Note<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ulta Lab Tests provides direct-access laboratory testing. Product links are included when they match the educational topic; purchasing a test is not a substitute for diagnosis, treatment, or urgent medical care.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Written by:<\/strong> John R. | <strong>Originally published:<\/strong> August 1, 2026 | <strong>Last updated:<\/strong> August 7, 2026<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Medical note:<\/strong> This guide is educational. A clinician should select and interpret testing in the context of symptoms, diagnoses, medications, pregnancy status, nutrition, hydration, and prior results. Do not start, stop, or change a prescription based on this article or one laboratory result.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CBC and anemia blood tests evaluate the number, size, and distribution of blood cells and help organize common anemia and blood-cell patterns.1 A complete blood count with differential and platelets measures red cells, hemoglobin, hematocrit, 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