{"id":2971,"date":"2026-08-01T20:04:14","date_gmt":"2026-08-02T03:04:14","guid":{"rendered":"https:\/\/www.ultalabtests.com\/blog\/?p=2971"},"modified":"2026-08-07T10:53:07","modified_gmt":"2026-08-07T17:53:07","slug":"pregnancy-blood-tests-prenatal-screening","status":"publish","type":"post","link":"https:\/\/www.ultalabtests.com\/blog\/pregnancy-and-fertility\/pregnancy-blood-tests-prenatal-screening\/","title":{"rendered":"Pregnancy Blood Tests and Prenatal Screening: hCG, Genetic Screening, and Tests by Trimester"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\" id=\"h-\">Pregnancy blood tests and prenatal urine tests are used for several different purposes. Early testing commonly evaluates <a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">pregnancy hormone status<\/a> when needed, <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">blood counts<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/abo-group-and-rh-type\">blood type and Rh factor<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">unexpected red-cell antibodies<\/a>, urine bacteria, immunity to selected infections, and infections that can affect the pregnant patient or newborn. Later testing may include <a href=\"https:\/\/www.ultalabtests.com\/test\/glucose-gestational-screen-50g-140-cutoff\">gestational diabetes screening<\/a>, repeat <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">blood counts<\/a> or antibody testing, risk-based repeat infection testing, and group B streptococcus screening. Thyroid, iron, kidney, liver, or other tests are added when history, symptoms, medication use, or prior results support them.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The exact schedule is not identical for every pregnancy. Prenatal clinicians adjust testing for gestational age, multiple pregnancy, prior complications, chronic conditions, local public-health requirements, new exposures, and results already documented in the medical record. Direct-access testing may supply selected data, but it cannot safely design or replace that coordinated schedule.<\/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 test types, specimens, panels, and common clinical uses.<\/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 and Understand Your Lab Results<\/a> explains reference intervals, flags, units, 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: How It Works and What to Expect<\/a> explains ordering, preparation, specimen collection, results, and follow-up.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/pregnancy-and-fertility\/fertility-lab-tests\/\">Fertility and preconception lab tests<\/a> covers testing before pregnancy.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/hormone\/womens-hormone-blood-tests\/\">Women\u2019s hormone blood tests<\/a> covers reproductive hormones, menopause, and PCOS.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/thyroid\/thyroid-blood-tests\/\">Thyroid blood tests<\/a> provides broader context for pregnancy-related thyroid questions.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/blood-disorders\/cbc-anemia-blood-tests\/\">Anemia and blood-count testing<\/a> explains <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a> findings, iron, <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">ferritin<\/a>, vitamin B12, and folate.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Direct-access laboratory testing does not replace prenatal care. Pregnancy testing often depends on gestational age, symptoms, ultrasound findings, blood pressure, prior results, medications, and the care plan established by an obstetric clinician. Severe bleeding, severe abdominal or pelvic pain, fainting, severe headache, vision changes, chest pain, shortness of breath, fluid leakage, reduced fetal movement, or another urgent pregnancy concern requires immediate medical care rather than routine self-ordered testing.<sup><a href=\"#ref-20\">20<\/a><\/sup><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><em>Blood and urine testing by stage of pregnancy, including <a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">hCG<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/abo-group-and-rh-type\">blood type and Rh factor<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">antibody screening<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a>, infection testing, <a href=\"https:\/\/www.ultalabtests.com\/test\/glucose-gestational-screen-50g-140-cutoff\">gestational diabetes screening<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/tsh-and-free-t4-test\">thyroid tests<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-iron-and-total-iron-binding-capacity-panel\">iron studies<\/a>, and prenatal genetic screening.<\/em><\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Key Facts<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Common early prenatal laboratory work includes a <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">complete blood count<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/abo-group-and-rh-type\">ABO blood type and Rh factor<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">red-blood-cell antibody screen<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/urinalysis-ua-complete\">urinalysis<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">urine culture<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/rubella-titer-test\">rubella immunity<\/a>, and screening for selected infections.<sup><a href=\"#ref-1\">1<\/a><\/sup><\/li>\n\n\n\n<li>A <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">urine culture<\/a>, not <a href=\"https:\/\/www.ultalabtests.com\/test\/urinalysis-ua-complete\">urinalysis<\/a> alone, is the established screening method for asymptomatic bacteriuria in pregnancy.<sup><a href=\"#ref-2\">2<\/a><\/sup><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/glucose-gestational-screen-50g-140-cutoff\">Gestational diabetes screening<\/a> is commonly performed at 24 to 28 weeks, although the prenatal team may evaluate glucose earlier when clinically indicated.<sup><a href=\"#ref-8\">8<\/a><\/sup><\/li>\n\n\n\n<li>Prenatal genetic screening estimates chance; chorionic villus sampling and amniocentesis are diagnostic procedures. A positive screening result is not a diagnosis.<sup><a href=\"#ref-10\">10<\/a><\/sup><sup><a href=\"#ref-12\">12<\/a><\/sup><sup><a href=\"#ref-13\">13<\/a><\/sup><\/li>\n\n\n\n<li>Pregnancy changes many laboratory values. Gestational age, assay method, pregnancy-specific reference intervals, symptoms, and trends all matter.<\/li>\n\n\n\n<li>Tests that can affect time-sensitive treatment, fetal assessment, Rh management, genetic counseling, or delivery planning should be coordinated through prenatal care.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What Pregnancy Lab Testing Can and Cannot Tell You<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Laboratory testing may help identify<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pregnancy-related <a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">hCG<\/a> when a pregnancy test is clinically useful<\/li>\n\n\n\n<li>Anemia, abnormal red-cell indices, low platelets, or other <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a> changes<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/abo-group-and-rh-type\">ABO blood group<\/a>, Rh D status, and clinically important <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">red-cell antibodies<\/a><\/li>\n\n\n\n<li>Asymptomatic bacteriuria or a urinary infection<\/li>\n\n\n\n<li>Immunity to <a href=\"https:\/\/www.ultalabtests.com\/test\/rubella-titer-test\">rubella<\/a> and, when appropriate, <a href=\"https:\/\/www.ultalabtests.com\/test\/varicella-immunity-screen\">varicella<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-b-surface-antigen-test-with-reflex-to-confirmation\">Hepatitis B<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-c-antibody-test-with-reflex-to-rna-quantitative-pcr\">hepatitis C<\/a>, HIV, <a href=\"https:\/\/www.ultalabtests.com\/test\/rpr-test-with-reflex-to-titer-and-confirmatory-testing\">syphilis<\/a>, and selected other infections<\/li>\n\n\n\n<li>Abnormal glucose regulation and possible gestational diabetes<\/li>\n\n\n\n<li>Thyroid dysfunction when testing is indicated<\/li>\n\n\n\n<li>Iron deficiency or another contributor to anemia<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">Hemoglobin variants<\/a> or thalassemia risk<\/li>\n\n\n\n<li>Increased probability of selected fetal chromosome or structural conditions through screening<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Laboratory testing cannot establish by itself<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Whether an early pregnancy is located inside the uterus<\/li>\n\n\n\n<li>Whether a pregnancy is viable based on one hCG value<\/li>\n\n\n\n<li>Exact gestational age without appropriate clinical dating<\/li>\n\n\n\n<li>Fetal anatomy, placental location, fetal growth, or fetal well-being<\/li>\n\n\n\n<li>The diagnosis of preeclampsia without blood pressure and clinical assessment<\/li>\n\n\n\n<li>Whether a fetus definitely has a genetic condition after a screening result<\/li>\n\n\n\n<li>Whether severe bleeding, pain, fainting, or reduced movement is safe to monitor at home<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ultrasound, examination, blood-pressure measurement, fetal monitoring, genetic counseling, and diagnostic procedures answer questions that routine blood and urine tests cannot.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Preconception and Trimester Testing Timeline<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This timeline describes common testing windows, not a personalized prenatal schedule. A prenatal clinician may move, repeat, omit, or add tests based on the individual pregnancy.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Stage<\/th><th>Common laboratory questions<\/th><th>Examples of tests commonly discussed<\/th><th>What requires prenatal-clinician coordination<\/th><\/tr><\/thead><tbody><tr><td>Before pregnancy<\/td><td>Is there a known anemia, immunity gap, chronic condition, infection risk, or inherited-disease risk that should be addressed before conception?<\/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-iron-and-total-iron-binding-capacity-panel\">ferritin or iron studies<\/a> when indicated; <a href=\"https:\/\/www.ultalabtests.com\/test\/rubella-titer-test\">rubella<\/a> or <a href=\"https:\/\/www.ultalabtests.com\/test\/varicella-immunity-screen\">varicella immunity<\/a> if records are uncertain; diabetes or <a href=\"https:\/\/www.ultalabtests.com\/test\/tsh-and-free-t4-test\">thyroid testing<\/a> based on history; infection and carrier screening based on guidelines and risk<\/td><td>Vaccine timing; medication changes; treatment of infection; genetic counseling; management of diabetes, thyroid disease, anemia, kidney disease, or other chronic conditions<\/td><\/tr><tr><td>Pregnancy confirmation and first prenatal evaluation<\/td><td>Is pregnancy confirmed when testing is needed? What are the patient\u2019s <a href=\"https:\/\/www.ultalabtests.com\/test\/abo-group-and-rh-type\">blood type<\/a>, Rh status, <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">blood counts<\/a>, antibody status, infection status, and <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">urine-culture result<\/a>?<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-qualitative-test\">Qualitative hCG<\/a> or <a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">quantitative hCG<\/a> for a defined question; <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\/abo-group-and-rh-type\">ABO\/Rh<\/a>; <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">RBC antibody screen<\/a>; <a href=\"https:\/\/www.ultalabtests.com\/test\/urinalysis-ua-complete\">urinalysis<\/a>; <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">urine culture<\/a>; <a href=\"https:\/\/www.ultalabtests.com\/test\/rubella-titer-test\">rubella IgG<\/a>; <a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-b-surface-antigen-test-with-reflex-to-confirmation\">HBsAg<\/a>; <a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-c-antibody-test-with-reflex-to-rna-quantitative-pcr\">hepatitis C testing<\/a>; HIV; <a href=\"https:\/\/www.ultalabtests.com\/test\/rpr-test-with-reflex-to-titer-and-confirmatory-testing\">syphilis<\/a>; <a href=\"https:\/\/www.ultalabtests.com\/test\/varicella-immunity-screen\">varicella immunity<\/a> when appropriate; age- and risk-based <a href=\"https:\/\/www.ultalabtests.com\/test\/chlamydia-and-gonorrhea-test\">chlamydia\/gonorrhea<\/a>; <a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">hemoglobinopathy testing<\/a> if no prior result<\/td><td>Dating and viability assessment; ultrasound; evaluation of pain or bleeding; interpretation of positive infection tests; positive antibody management; Rh immune globulin decisions; carrier-screening plan<\/td><\/tr><tr><td>About 10 weeks and later<\/td><td>Is prenatal chromosome screening desired after informed counseling?<\/td><td>Cell-free DNA screening may be available from about 10 weeks; other first-trimester screening pathways may combine blood tests and ultrasound<\/td><td>Selection of one screening strategy; pretest counseling; ultrasound coordination; follow-up of positive, negative, or nonreportable results<\/td><\/tr><tr><td>First trimester diagnostic window<\/td><td>Is definitive fetal genetic information needed because of preference, family history, ultrasound findings, or a screening result?<\/td><td>Chorionic villus sampling uses placental tissue rather than a routine blood draw<\/td><td>CVS is an invasive diagnostic procedure and must be arranged through an experienced prenatal team, usually with genetic counseling<\/td><\/tr><tr><td>Second trimester screening window<\/td><td>Is screening for neural-tube defects or selected chromosome conditions desired or still needed?<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/maternal-afp-test\">Maternal serum AFP<\/a>, triple screen, or quad screen depending on the selected pathway; <a href=\"https:\/\/www.ultalabtests.com\/test\/maternal-afp-test\">AFP<\/a> is commonly performed around 15 to 20 weeks<\/td><td>Correct gestational dating, interpretation, ultrasound correlation, and follow-up of an abnormal result<\/td><\/tr><tr><td>About 24 to 28 weeks<\/td><td>Is gestational diabetes present? Has anemia developed or worsened?<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/glucose-gestational-screen-50g-140-cutoff\">Glucose challenge<\/a> and, when indicated, diagnostic oral glucose tolerance testing; repeat <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a> according to the prenatal plan<\/td><td>Choice of one-step or two-step glucose pathway; fasting instructions; diagnosis; nutrition and medication management<\/td><\/tr><tr><td>Around 28 weeks when relevant<\/td><td>Has an Rh-negative patient developed antibodies, and is Rh immune globulin indicated?<\/td><td>Repeat <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">antibody screen<\/a> may be used in the prenatal plan<\/td><td>Rh immune globulin, interpretation after prophylaxis, sensitization management, bleeding or procedure-related decisions<\/td><\/tr><tr><td>Third trimester<\/td><td>Has infection risk changed? Are repeat tests required by the clinical plan, state law, local epidemiology, or prior results?<\/td><td>Repeat syphilis testing; HIV, chlamydia, gonorrhea, hepatitis B, or other testing when indicated; repeat <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a> or targeted chemistry tests when clinically needed<\/td><td>Treatment, partner management, fetal or newborn planning, and timing around delivery<\/td><\/tr><tr><td>About 36 to 37 weeks<\/td><td>Is group B streptococcus present in the vagina or rectum close to delivery?<\/td><td>Vaginal-rectal GBS culture<\/td><td>Correct specimen collection, documentation, and intrapartum antibiotic plan; this is not replaced by an earlier <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">urine culture<\/a><\/td><\/tr><tr><td>Labor, delivery, or urgent presentation<\/td><td>Are critical prenatal results missing, or is an acute complication suspected?<\/td><td>Rapid HIV testing if status is unknown; infection, <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">blood count<\/a>, chemistry, coagulation, urine, or other tests selected for the situation<\/td><td>Immediate obstetric assessment, fetal monitoring, imaging, treatment, transfusion planning, and newborn prophylaxis<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Screening Versus Diagnostic Prenatal Testing<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Test or procedure<\/th><th>Category<\/th><th>What it asks<\/th><th>What a result means<\/th><th>Oversight needed<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a>, infection tests, <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">urine culture<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/glucose-gestational-screen-50g-140-cutoff\">glucose screening<\/a><\/td><td>Maternal screening<\/td><td>Is there a maternal condition or exposure that may affect pregnancy care?<\/td><td>A screening result may be normal, abnormal, or require confirmation; it does not evaluate fetal anatomy<\/td><td>Ordered and interpreted within prenatal care, especially when positive or time-sensitive<\/td><\/tr><tr><td>Carrier screening<\/td><td>Reproductive genetic screening<\/td><td>Does a parent carry a gene variant that could be inherited?<\/td><td>A carrier result does not mean the parent has an affected fetus; partner testing and residual-risk counseling may be needed<\/td><td>Pretest and post-test counseling; partner and fetal-testing decisions<\/td><\/tr><tr><td>Cell-free DNA or NIPS<\/td><td>Fetal chromosome screening<\/td><td>Is the probability of selected chromosome conditions increased?<\/td><td>High-risk, low-risk, or nonreportable results are probabilities, not diagnoses<\/td><td>Prenatal clinician or genetics professional should select the test and manage follow-up; positive results require diagnostic confirmation before irreversible decisions<sup><a href=\"#ref-11\">11<\/a><\/sup><sup><a href=\"#ref-12\">12<\/a><\/sup><\/td><\/tr><tr><td>First-trimester or second-trimester serum screening<\/td><td>Fetal risk screening<\/td><td>Is the calculated chance of selected chromosome or structural conditions increased?<\/td><td>Risk estimate depends on gestational age and other clinical data; abnormal results need counseling and follow-up<\/td><td>Correct timing, dating, and integration with ultrasound and prior screening<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/maternal-afp-test\">Maternal serum AFP<\/a><\/td><td>Neural-tube and selected condition screening<\/td><td>Is <a href=\"https:\/\/www.ultalabtests.com\/test\/maternal-afp-test\">AFP<\/a> higher or lower than expected for the pregnancy context?<\/td><td>It does not diagnose a fetal condition; dating, multiples, maternal factors, ultrasound, and additional testing matter<sup><a href=\"#ref-14\">14<\/a><\/sup><\/td><td>Prenatal interpretation and follow-up<\/td><\/tr><tr><td>Chorionic villus sampling<\/td><td>Diagnostic procedure<\/td><td>Do sampled placental cells show a chromosome or genetic condition being evaluated?<\/td><td>Provides diagnostic information for the tested condition, but has procedural limitations and risks<\/td><td>Maternal-fetal medicine, obstetric, and genetics oversight<\/td><\/tr><tr><td>Amniocentesis<\/td><td>Diagnostic procedure<\/td><td>Do sampled amniotic-fluid cells or analytes show a condition being evaluated?<\/td><td>Provides diagnostic information for the tested condition, but has procedural limitations and risks<\/td><td>Maternal-fetal medicine, obstetric, and genetics oversight<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">ACOG recommends that prenatal genetic screening and diagnostic-testing options be discussed and offered to all pregnant patients, while respecting the patient\u2019s choice to accept or decline testing.<sup><a href=\"#ref-10\">10<\/a><\/sup> Choosing among these options is not simply a matter of ordering the largest panel. The decision should account for gestational age, what conditions the test covers, prior screening, ultrasound findings, personal values, and how the patient would use the information.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">hCG Testing in Pregnancy<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Human chorionic gonadotropin, or <a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">hCG<\/a>, is produced during pregnancy. A <a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-qualitative-test\">qualitative hCG test<\/a> reports whether hCG is detected. A <a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">quantitative hCG test<\/a> reports a numerical concentration.<sup><a href=\"#ref-3\">3<\/a><\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What hCG may help answer<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Whether hCG is detected when pregnancy confirmation is needed<\/li>\n\n\n\n<li>Whether a numerical hCG trend may contribute to evaluation of an early-pregnancy concern<\/li>\n\n\n\n<li>Whether hCG has fallen to an expected level after a pregnancy-related event when a clinician is monitoring it<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">What one hCG value cannot answer<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A single quantitative result generally cannot prove that the pregnancy is viable, locate the pregnancy, establish exact gestational age, or exclude ectopic pregnancy. Results overlap widely among normal and abnormal pregnancies. When pain, bleeding, uncertain dating, or another concern exists, the prenatal team may use <a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">serial hCG measurements<\/a> together with transvaginal ultrasound and clinical assessment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do not delay urgent evaluation to obtain a self-ordered <a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">hCG level<\/a> when there is severe pelvic or abdominal pain, shoulder pain, heavy bleeding, dizziness, or fainting.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/www.ultalabtests.com\/test\/abo-group-and-rh-type\">Blood Type<\/a>, Rh Factor, and the <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">Antibody Screen<\/a><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Three related results answer different questions:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Result<\/th><th>What it tells the prenatal team<\/th><th>What it does not tell the team<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/abo-group-and-rh-type\">ABO group<\/a><\/td><td>Whether the patient is type A, B, AB, or O<\/td><td>It does not determine whether fetal red cells are at risk from a maternal antibody<\/td><\/tr><tr><td>Rh D type<\/td><td>Whether the patient is Rh positive or Rh negative<\/td><td>Rh-negative status alone does not mean sensitization has occurred<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">RBC antibody screen<\/a><\/td><td>Whether unexpected antibodies against red-cell antigens are detectable<\/td><td>A positive screen does not identify the antibody until additional testing is performed<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">antibody screen<\/a> is usually performed early in pregnancy. Clinically important antibodies may include anti-D and antibodies to other antigens, such as Kell. If the screen is positive, the laboratory may perform <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">antibody identification<\/a>, and the prenatal team may add titers, paternal or fetal antigen assessment, or specialized fetal surveillance depending on the antibody.<sup><a href=\"#ref-15\">15<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For an Rh-negative patient who is not already sensitized, the prenatal team may recommend Rh(D) immune globulin at a routine antepartum point and after specific events such as bleeding, trauma, procedures, pregnancy loss, or delivery of an Rh-positive infant. The regimen and timing must be managed clinically. Rh immune globulin can also affect later antibody-screen interpretation, so the laboratory and clinician need the administration history.<sup><a href=\"#ref-16\">16<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A direct-access <a href=\"https:\/\/www.ultalabtests.com\/test\/abo-group-and-rh-type\">ABO\/Rh<\/a> or antibody result cannot replace the action plan that follows. A positive <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">antibody screen<\/a>, an Rh-negative result with bleeding, or uncertainty about prior Rh immune globulin requires prompt prenatal follow-up.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">Complete Blood Count<\/a> and Iron Status<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For a broader explanation of <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a> patterns, hemoglobin, red-cell indices, <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">ferritin<\/a>, iron studies, vitamin B12, and folate, see the <a href=\"https:\/\/www.ultalabtests.com\/blog\/blood-disorders\/cbc-anemia-blood-tests\/\">anemia and blood-count testing guide<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A pregnancy <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a> measures red cells, hemoglobin, hematocrit, red-cell indices, white cells, and platelets. It can help identify anemia, macrocytosis or microcytosis, low platelets, and other patterns that warrant follow-up.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pregnancy expands plasma volume, so hemoglobin and hematocrit often decrease even when red-cell mass increases. White blood cell counts may rise physiologically, and platelet counts may shift. These changes make pregnancy-specific interpretation important. A flagged result based on a nonpregnant reference range may not represent disease, while a result technically inside a broad adult range may still matter in pregnancy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-iron-and-total-iron-binding-capacity-panel\">Ferritin and iron studies<\/a> are not interchangeable with a <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> reflects stored iron but can rise with inflammation or illness. Serum iron varies with timing, meals, and supplements. When anemia, low mean corpuscular volume, diet, symptoms, blood loss, or a prior history raises concern, a prenatal clinician may use <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">ferritin<\/a> and other iron measures to distinguish iron deficiency from <a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">hemoglobinopathy<\/a> or another cause.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The USPSTF concluded in 2024 that evidence is insufficient to determine the balance of benefits and harms of routine screening or routine supplementation specifically for iron deficiency with or without anemia in asymptomatic pregnant patients. Other organizations and clinical practices vary, so testing decisions should be individualized rather than assumed to be universal.<sup><a href=\"#ref-17\">17<\/a><\/sup><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/www.ultalabtests.com\/test\/urinalysis-ua-complete\">Urinalysis<\/a> and Screening for Asymptomatic Bacteriuria<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.ultalabtests.com\/test\/urinalysis-ua-complete\">Urinalysis<\/a> and <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">urine culture<\/a> answer different questions.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/www.ultalabtests.com\/test\/urinalysis-ua-complete\">Urinalysis<\/a><\/strong> examines chemical and microscopic findings such as leukocyte esterase, nitrite, blood, glucose, ketones, protein, cells, and bacteria. It can support evaluation but may be affected by contamination.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">Urine culture<\/a><\/strong> attempts to grow and identify bacteria and is the established screening test for asymptomatic bacteriuria in pregnancy.<sup><a href=\"#ref-2\">2<\/a><\/sup><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The USPSTF recommends a midstream, clean-catch <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">urine culture<\/a> at the first prenatal visit or at 12 to 16 weeks, whichever is earlier.<sup><a href=\"#ref-2\">2<\/a><\/sup> A positive culture requires pregnancy-appropriate treatment and follow-up through a clinician. Antibiotic selection depends on the organism, susceptibility, pregnancy stage, allergies, and safety.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Urine protein on a dipstick or routine <a href=\"https:\/\/www.ultalabtests.com\/test\/urinalysis-ua-complete\">urinalysis<\/a> does not diagnose preeclampsia. Suspected preeclampsia requires blood pressure, symptoms, gestational age, and clinician-selected blood and urine testing. Likewise, urine glucose does not replace blood-based gestational diabetes testing.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Prenatal Infection-Testing Crosswalk<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Infection or immunity question<\/th><th>Who is commonly tested and when<\/th><th>Common initial laboratory approach<\/th><th>Follow-up and direct-access limitation<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/rpr-test-with-reflex-to-titer-and-confirmatory-testing\">Syphilis<\/a><\/td><td>Universal testing as early as possible in each pregnancy; repeat testing later according to current ACOG guidance, exposure, risk, local epidemiology, or law<\/td><td>Treponemal and nontreponemal testing in an accepted algorithm<\/td><td>Discordant or reactive results require prompt confirmation, staging, treatment, partner services, and fetal\/newborn planning<sup><a href=\"#ref-4\">4<\/a><\/sup><\/td><\/tr><tr><td>HIV<\/td><td>All pregnant patients early; repeat in the third trimester when risk is increased; rapid testing at labor or delivery when status is unknown<\/td><td>Fourth-generation HIV antigen\/antibody test, with supplemental confirmation and nucleic-acid testing when reactive<\/td><td>A reactive screen is preliminary and needs urgent confirmatory care and treatment planning<sup><a href=\"#ref-5\">5<\/a><\/sup><sup><a href=\"#ref-7\">7<\/a><\/sup><\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-b-surface-antigen-test-with-reflex-to-confirmation\">Hepatitis B<\/a><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-b-surface-antigen-test-with-reflex-to-confirmation\">HBsAg<\/a> at the first prenatal visit of every pregnancy, even if previously tested; delivery testing when status is unknown or risk is ongoing<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-b-surface-antigen-test-with-reflex-to-confirmation\">Hepatitis B surface antigen<\/a>, generally with confirmatory testing when reactive<\/td><td>Positive results require additional maternal evaluation and a documented newborn vaccine and immune-globulin plan<sup><a href=\"#ref-6\">6<\/a><\/sup><\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-c-antibody-test-with-reflex-to-rna-quantitative-pcr\">Hepatitis C<\/a><\/td><td>Universal screening during each pregnancy, except in rare settings with extremely low prevalence under CDC criteria<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-c-antibody-test-with-reflex-to-rna-quantitative-pcr\">HCV antibody<\/a> with reflex or follow-up HCV RNA testing<\/td><td>A reactive antibody does not prove current infection; RNA testing and specialist follow-up are needed<sup><a href=\"#ref-9\">9<\/a><\/sup><\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/chlamydia-and-gonorrhea-test\">Chlamydia<\/a><\/td><td>All pregnant patients younger than 25 and patients 25 or older with increased risk; repeat in the third trimester for younger or at-risk patients<\/td><td>Nucleic-acid amplification test from the recommended specimen<\/td><td>Positive results require pregnancy-appropriate treatment, partner management, test of cure, and retesting<sup><a href=\"#ref-7\">7<\/a><\/sup><\/td><\/tr><tr><td>Gonorrhea<\/td><td>All pregnant patients younger than 25 and patients 25 or older with increased risk; repeat when risk persists<\/td><td>Nucleic-acid amplification test from the recommended specimen<\/td><td>Positive results require treatment, partner management, and retesting<sup><a href=\"#ref-7\">7<\/a><\/sup><\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/rubella-titer-test\">Rubella immunity<\/a><\/td><td>Commonly assessed early when reliable immunity documentation is not available<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/rubella-titer-test\">Rubella IgG<\/a> immunity testing<\/td><td>Nonimmune patients need exposure counseling and postpartum vaccination planning; MMR is a live vaccine and is not given during pregnancy<sup><a href=\"#ref-19\">19<\/a><\/sup><\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/varicella-immunity-screen\">Varicella immunity<\/a><\/td><td>Tested when history or documentation is uncertain and the result would change management<\/td><td>Varicella-zoster virus IgG<\/td><td>A susceptible pregnant patient with exposure requires prompt clinical assessment; varicella vaccine is contraindicated during pregnancy and is generally addressed postpartum<sup><a href=\"#ref-19\">19<\/a><\/sup><\/td><\/tr><tr><td>Group B streptococcus<\/td><td>Vaginal-rectal screening late in each pregnancy, commonly during the 36th or 37th week<\/td><td>Culture of a properly collected vaginal-rectal swab<\/td><td>Result must be available to the delivery team for intrapartum management; an early <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">urine culture<\/a> or blood test does not replace the late-pregnancy swab<sup><a href=\"#ref-18\">18<\/a><\/sup><\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/quantiferon-tb-gold-plus-tuberculosis-test\">Tuberculosis<\/a><\/td><td>Risk-based rather than universal<\/td><td>TB blood test or skin test selected by the clinician<\/td><td>Positive screening requires evaluation for active disease, including clinical assessment and sometimes imaging<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/herpes-simplex-virus-1-and-2-igg-antibody-herpeselect-test-with-reflex-to-hsv-2-inhibition\">HSV<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/cytomegalovirus-antibodies-igg-igm\">CMV<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/toxoplasma-igg-igm-antibodies-test\">toxoplasmosis<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/parvovirus-b19-igg-igm-antibodies-test\">parvovirus B19<\/a>, or broad TORCH panels<\/td><td>Not routine universal blood screening for all asymptomatic pregnancies; testing is driven by symptoms, exposure, ultrasound findings, or specific history<\/td><td>Pathogen-specific serology, molecular testing, or other clinician-selected tests<\/td><td>Timing, prior immunity, cross-reactivity, false positives, and fetal implications make indiscriminate self-ordering difficult to interpret; routine HSV-2 serologic screening in asymptomatic pregnancy is not recommended by CDC<sup><a href=\"#ref-7\">7<\/a><\/sup><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A negative infection test is a snapshot. New exposure after testing can change status. A positive or indeterminate result may require a different confirmatory method, treatment, repeat timing, and newborn precautions. These are clinical-care decisions, not merely laboratory interpretation questions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Gestational Diabetes and Pregnancy Glucose Testing<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The USPSTF recommends screening for gestational diabetes at 24 weeks or later, and screening in the United States commonly occurs before 28 weeks.<sup><a href=\"#ref-8\">8<\/a><\/sup> Practices use more than one accepted pathway:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A <strong>two-step approach<\/strong> begins with a <a href=\"https:\/\/www.ultalabtests.com\/test\/glucose-gestational-screen-50g-140-cutoff\">one-hour glucose challenge<\/a> that usually does not require fasting. If the screening value is above the program\u2019s threshold, a longer fasting <a href=\"https:\/\/www.ultalabtests.com\/test\/gestational-glucose-tolerance-test-4-specimens-100g\">oral glucose tolerance test<\/a> is used for diagnosis.<\/li>\n\n\n\n<li>A <strong>one-step approach<\/strong> uses a <a href=\"https:\/\/www.ultalabtests.com\/test\/gestational-glucose-tolerance-test-3-specimens-75g\">fasting oral glucose tolerance test<\/a> as the diagnostic test.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The preparation instructions are not interchangeable. Eating when a fasting test was ordered, fasting unnecessarily before a nonfasting challenge, vomiting the glucose drink, completing the draw at the wrong time, or being acutely ill can make the result difficult to use.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A screening result above the cutoff is not automatically a diagnosis. Conversely, a normal early <a href=\"https:\/\/www.ultalabtests.com\/test\/glucose\">fasting glucose<\/a> or <a href=\"https:\/\/www.ultalabtests.com\/test\/a1c-test\">A1C<\/a> does not replace the standard later gestational diabetes pathway. Early testing may be used to look for previously unrecognized diabetes or in other selected circumstances, but the prenatal clinician should determine what the result changes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Thyroid Testing During Pregnancy<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For a broader explanation of TSH, <a href=\"https:\/\/www.ultalabtests.com\/test\/t4-free\">free T4<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/t3-free\">free T3<\/a>, antibodies, assay interference, and thyroid-result patterns, see the <a href=\"https:\/\/www.ultalabtests.com\/blog\/thyroid\/thyroid-blood-tests\/\">thyroid blood tests guide<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pregnancy alters thyroid physiology. <a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">hCG<\/a> can lower <a href=\"https:\/\/www.ultalabtests.com\/test\/tsh-and-free-t4-test\">TSH<\/a> early in pregnancy, estrogen increases thyroid-binding proteins, and assay performance varies. The American Thyroid Association published updated 2026 guidelines for thyroid disease in preconception, pregnancy, and postpartum care.<sup><a href=\"#ref-21\">21<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.ultalabtests.com\/test\/tsh-and-free-t4-test\">TSH and free T4<\/a> may be especially relevant for patients with known thyroid disease, thyroid medication use, prior thyroid surgery or radioactive iodine, <a href=\"https:\/\/www.ultalabtests.com\/test\/thyroid-peroxidase-and-thyroglobulin-antibodies\">thyroid antibodies<\/a>, goiter, autoimmune disease, symptoms, infertility history, prior pregnancy complications, or other risk factors. The test choice and follow-up interval should be established by the prenatal or endocrine clinician.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Interpretation should use the laboratory method and pregnancy-appropriate reference information whenever available. A nonpregnant TSH range, a self-defined \u201coptimal\u201d target, or isolated <a href=\"https:\/\/www.ultalabtests.com\/test\/t3-free\">free T3<\/a> testing should not be used to adjust thyroid medication during pregnancy. Medication changes can affect both maternal and fetal health and require clinician oversight.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hemoglobinopathy Screening<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">Hemoglobinopathies<\/a> include structural hemoglobin variants, such as hemoglobin S, and disorders of hemoglobin production, such as thalassemias. A <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a> can show microcytosis or another clue, but it cannot identify every carrier. ACOG\u2019s updated guidance supports universal <a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">hemoglobinopathy testing<\/a> for people planning pregnancy or at the initial prenatal visit when prior results are unavailable.<sup><a href=\"#ref-22\">22<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Testing may use hemoglobin electrophoresis, high-performance liquid chromatography, capillary methods, or molecular testing depending on the question. Recent transfusion can obscure results. If a patient is a carrier, partner testing and genetic counseling may be appropriate. A parental carrier result does not diagnose the fetus.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pregnancy-Specific Preparation and Interpretation Matrix<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Test or situation<\/th><th>Preparation or collection issue<\/th><th>Pregnancy-specific interpretation issue<\/th><th>When to contact the prenatal team<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a><\/td><td>Usually no fasting; hydration and recent IV fluids can change concentration<\/td><td>Plasma-volume expansion may lower hemoglobin and hematocrit; WBC and platelets may shift<\/td><td>Significant anemia, low platelets, abnormal smear findings, symptoms, or a rapidly changing trend<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-iron-and-total-iron-binding-capacity-panel\">Ferritin and iron studies<\/a><\/td><td>Iron supplements, meals, collection time, inflammation, and recent infusion can affect components<\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">Ferritin<\/a> may look normal or high during inflammation despite iron restriction<\/td><td>Anemia, low MCV, intolerance of iron, prior <a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">hemoglobinopathy<\/a>, or unclear cause<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">hCG quantitative<\/a><\/td><td>No routine fasting; use the same laboratory when trends are being compared when practical<\/td><td>Expected ranges overlap widely; one number does not establish location or viability<\/td><td>Pain, bleeding, fainting, an unexpected trend, or a result that was ordered for an urgent concern<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/abo-group-and-rh-type\">ABO\/Rh<\/a> and <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">antibody screen<\/a><\/td><td>No fasting; report transfusion, prior pregnancies, antibodies, and Rh immune globulin<\/td><td>Passive anti-D after Rh immune globulin can affect results; a positive screen needs identification<\/td><td>Rh-negative status with bleeding or a procedure; any positive <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">antibody screen<\/a><\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">Urine culture<\/a><\/td><td>Midstream clean-catch technique and prompt transport reduce contamination<\/td><td>Mixed flora may reflect contamination; treatment thresholds and follow-up differ in pregnancy<\/td><td>Positive culture, urinary symptoms, fever, flank pain, or repeated contaminated specimens<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/rubella-titer-test\">Rubella<\/a> or <a href=\"https:\/\/www.ultalabtests.com\/test\/varicella-immunity-screen\">varicella IgG<\/a><\/td><td>No fasting; vaccination and infection history matter<\/td><td>Immunity assays do not evaluate an acute exposure by themselves<\/td><td>Nonimmune result, rash, exposure, or uncertainty about vaccination timing<\/td><\/tr><tr><td>HIV, <a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-b-surface-antigen-test-with-reflex-to-confirmation\">HBV<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-c-antibody-test-with-reflex-to-rna-quantitative-pcr\">HCV<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/rpr-test-with-reflex-to-titer-and-confirmatory-testing\">syphilis<\/a><\/td><td>No routine fasting; early window periods and recent exposure matter<\/td><td>Reactive screens often require confirmatory testing; negative results may not exclude a very recent infection<\/td><td>Any reactive, indeterminate, discordant, or new-exposure result<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/glucose-gestational-screen-50g-140-cutoff\">Glucose challenge<\/a><\/td><td>Follow the exact nonfasting instructions used by the prenatal program<\/td><td>It is a screening test; thresholds are protocol-specific<\/td><td>Result above the program threshold, vomiting, mistimed draw, or acute illness<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/gestational-glucose-tolerance-test-4-specimens-100g\">Oral glucose tolerance test<\/a><\/td><td>Fasting and timed blood draws are essential; activity, smoking, food, and illness may affect results<\/td><td>Diagnostic criteria depend on the selected one-step or two-step protocol<\/td><td>Any abnormal value or incomplete test<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/tsh-and-free-t4-test\">TSH and free T4<\/a><\/td><td>Report thyroid medication, biotin-containing supplements, timing of dose, and recent illness; do not stop medication without instruction<\/td><td>hCG, binding-protein changes, assay method, gestational age, and treatment targets matter<\/td><td>Abnormal result, symptoms, known thyroid disease, or a contemplated medication change<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">Hemoglobinopathy evaluation<\/a><\/td><td>Recent transfusion can mask the patient\u2019s native hemoglobin pattern<\/td><td>Pregnancy does not turn a carrier result into fetal diagnosis; partner and genetic context matter<\/td><td>Any variant, suspected thalassemia, or discordance with <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a> indices<\/td><\/tr><tr><td>Prenatal serum or cfDNA screening<\/td><td>Correct gestational age, singleton versus multiple pregnancy, donor egg, vanishing twin, transplant history, and prior screening matter<\/td><td>Results are probabilities and may be nonreportable; placental DNA may not match fetal status in every case<\/td><td>High-risk, positive, no-call, discordant, or unexpected result before any major decision<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Always follow the instructions attached to the specific laboratory order. General preparation advice cannot override the selected method or prenatal program.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fictional Prenatal Laboratory-Report Walkthrough<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The following report is fictional and is designed to show how context changes interpretation. It is not a patient-specific schedule or diagnostic example.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Early prenatal report at 9 weeks<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Result<\/th><th>Fictional value<\/th><th>Initial reading<\/th><th>What the prenatal team still needs to consider<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/abo-group-and-rh-type\">ABO\/Rh<\/a><\/td><td>A negative<\/td><td>The patient is Rh negative<\/td><td>Antibody status, prior Rh immune globulin, bleeding or procedures, and the pregnancy\u2019s Rh-management plan<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">RBC antibody screen<\/a><\/td><td>Negative<\/td><td>No unexpected RBC antibodies detected at this time<\/td><td>Repeat testing may be part of the prenatal plan; a later sensitizing event can change management<\/td><\/tr><tr><td>Hemoglobin<\/td><td>11.6 g\/dL<\/td><td>Not markedly low in this fictional example<\/td><td>Symptoms, laboratory pregnancy ranges, prior values, diet, MCV, and later trend<\/td><\/tr><tr><td>MCV<\/td><td>86 fL<\/td><td>Normocytic red cells<\/td><td>Does not rule out early iron depletion or every <a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">hemoglobinopathy<\/a><\/td><\/tr><tr><td>Platelets<\/td><td>250 x 10^9\/L<\/td><td>Within the laboratory\u2019s reported interval<\/td><td>Trend and clinical context remain important<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">Urine culture<\/a><\/td><td>No growth<\/td><td>No bacteriuria detected in the submitted specimen<\/td><td>New urinary symptoms later require reassessment<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/rubella-titer-test\">Rubella IgG<\/a><\/td><td>Immune<\/td><td>Laboratory evidence of immunity<\/td><td>No MMR vaccination is needed during pregnancy; documentation should remain in the prenatal record<\/td><\/tr><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-b-surface-antigen-test-with-reflex-to-confirmation\">HBsAg<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-c-antibody-test-with-reflex-to-rna-quantitative-pcr\">HCV antibody<\/a>, HIV screen, <a href=\"https:\/\/www.ultalabtests.com\/test\/rpr-test-with-reflex-to-titer-and-confirmatory-testing\">syphilis<\/a> screen<\/td><td>Nonreactive<\/td><td>No laboratory evidence detected by these screening tests at that time<\/td><td>Window periods, later exposure, repeat-testing recommendations, and local requirements<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The Rh-negative result is not an emergency, and the negative <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">antibody screen<\/a> is reassuring, but the patient still needs a clinician-managed Rh plan. The infection results are not lifetime guarantees. The <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a> is interpreted with pregnancy and trend context rather than a nonpregnant \u201coptimal\u201d range.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Follow-up report at 27 weeks<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Result<\/th><th>Fictional value<\/th><th>Initial reading<\/th><th>Appropriate next step<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/glucose-gestational-screen-50g-140-cutoff\">One-hour glucose challenge<\/a><\/td><td>148 mg\/dL, flagged<\/td><td>Above this fictional program\u2019s screening cutoff<\/td><td>It is not a diagnosis; complete the prenatal program\u2019s diagnostic test under the exact preparation instructions<\/td><\/tr><tr><td>Hemoglobin<\/td><td>10.3 g\/dL<\/td><td>Anemia is possible<\/td><td>Review MCV, symptoms, diet, bleeding history, <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">ferritin<\/a> or other studies, and alternative causes<\/td><\/tr><tr><td>MCV<\/td><td>78 fL<\/td><td>Microcytosis<\/td><td>Iron deficiency and hemoglobinopathy are among the possibilities; do not assume one cause from MCV alone<\/td><\/tr><tr><td>Repeat <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">antibody screen<\/a><\/td><td>Negative<\/td><td>No antibody detected at this time<\/td><td>The prenatal clinician determines Rh immune globulin timing and any later repeat testing<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The key lesson is that a flagged glucose screen leads to a diagnostic pathway, not an immediate diagnosis. Likewise, a microcytic anemia pattern needs cause-focused evaluation before assuming that more iron is the only answer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Direct-Access Testing Cannot Replace During Pregnancy<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Direct-access testing can sometimes help a patient obtain a selected blood or urine result, verify a prior measurement, or prepare for a more informed appointment. It cannot replace:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Establishing prenatal care and an individualized care plan<\/li>\n\n\n\n<li>Ultrasound for pregnancy location, dating, anatomy, placental assessment, growth, or fetal well-being<\/li>\n\n\n\n<li>Blood-pressure measurement and clinical evaluation for preeclampsia<\/li>\n\n\n\n<li>Evaluation of bleeding, pain, fainting, fever, severe vomiting, or fluid leakage<\/li>\n\n\n\n<li>Fetal-movement assessment, nonstress testing, or other fetal surveillance<\/li>\n\n\n\n<li>Genetic counseling and selection of prenatal screening versus diagnostic procedures<\/li>\n\n\n\n<li>Chorionic villus sampling, amniocentesis, or interpretation of fetal diagnostic results<\/li>\n\n\n\n<li>Rh immune globulin administration or management of a positive red-cell antibody<\/li>\n\n\n\n<li>Diagnosis and treatment of gestational diabetes<\/li>\n\n\n\n<li>Treatment of urinary or sexually transmitted infections<\/li>\n\n\n\n<li>Newborn prophylaxis planning after positive <a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-b-surface-antigen-test-with-reflex-to-confirmation\">hepatitis B<\/a>, HIV, <a href=\"https:\/\/www.ultalabtests.com\/test\/rpr-test-with-reflex-to-titer-and-confirmatory-testing\">syphilis<\/a>, or other results<\/li>\n\n\n\n<li>Late-pregnancy group B strep specimen collection and delivery planning<\/li>\n\n\n\n<li>Medication initiation, discontinuation, or dose adjustment<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A test can be technically available yet still be inappropriate to order outside care because the timing, specimen, confirmation, treatment, or fetal implications require immediate coordination.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">When Direct-Access Testing May Be a Limited Adjunct<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Where available and legally permitted, selected direct-access tests may be useful when the patient has a clear question and a follow-up plan. Examples may include confirming a documented test was not completed, obtaining a <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a> or <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">ferritin<\/a> result before a scheduled clinician discussion, or checking a clinician-requested thyroid marker when the ordering pathway has been coordinated.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before ordering, ask:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Is this the correct test and method for the prenatal question?<\/li>\n\n\n\n<li>Is it being collected in the correct gestational window?<\/li>\n\n\n\n<li>Does it require fasting, timed specimens, a special swab, or ultrasound data?<\/li>\n\n\n\n<li>Could a positive or critical result require treatment the same day?<\/li>\n\n\n\n<li>Will the prenatal team accept and act on an outside result?<\/li>\n\n\n\n<li>Is confirmatory testing automatically included or separately ordered?<\/li>\n\n\n\n<li>Could the test duplicate a screening strategy already completed?<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Learn more in <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>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">When Not to Order a Pregnancy Test on Your Own<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Avoid using routine self-ordered testing to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reassure yourself about severe bleeding, severe pain, fainting, or reduced fetal movement<\/li>\n\n\n\n<li>Diagnose ectopic pregnancy from one <a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">hCG level<\/a><\/li>\n\n\n\n<li>Repeat hCG indefinitely after an ultrasound has already established the relevant clinical information<\/li>\n\n\n\n<li>Use <a href=\"https:\/\/www.ultalabtests.com\/test\/lh\">LH<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/fsh-test\">FSH<\/a>, or <a href=\"https:\/\/www.ultalabtests.com\/test\/amh-test-female\">AMH<\/a> to monitor an established pregnancy<\/li>\n\n\n\n<li>Order broad TORCH, <a href=\"https:\/\/www.ultalabtests.com\/test\/herpes-simplex-virus-1-and-2-igg-antibody-herpeselect-test-with-reflex-to-hsv-2-inhibition\">HSV<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/cytomegalovirus-antibodies-igg-igm\">CMV<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/toxoplasma-igg-igm-antibodies-test\">toxoplasmosis<\/a>, or autoimmune panels without a defined clinical question<\/li>\n\n\n\n<li>Combine multiple overlapping prenatal genetic screening strategies without counseling<\/li>\n\n\n\n<li>Treat a cell-free DNA result as fetal diagnosis<\/li>\n\n\n\n<li>Adjust thyroid, diabetes, blood-pressure, anticoagulant, or iron medication without the prescribing clinician<\/li>\n\n\n\n<li>Substitute <a href=\"https:\/\/www.ultalabtests.com\/test\/a1c-test\">A1C<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/glucose\">fasting glucose<\/a>, or urine glucose for the recommended gestational diabetes pathway<\/li>\n\n\n\n<li>Use <a href=\"https:\/\/www.ultalabtests.com\/test\/urinalysis-ua-complete\">urinalysis<\/a> alone instead of a <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">urine culture<\/a> for asymptomatic bacteriuria screening<\/li>\n\n\n\n<li>Assume a first-trimester negative infection test rules out later exposure<\/li>\n\n\n\n<li>Use a nonpregnant reference range to declare a result normal or abnormal<\/li>\n\n\n\n<li>Delay ultrasound, examination, or urgent obstetric assessment while waiting for laboratory results<\/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 testing is useful when it answers a specific question. Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A repeat specimen after a contaminated <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">urine culture<\/a><\/li>\n\n\n\n<li>Confirmatory algorithms after reactive HIV, hepatitis, or <a href=\"https:\/\/www.ultalabtests.com\/test\/rpr-test-with-reflex-to-titer-and-confirmatory-testing\">syphilis screening<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-c-antibody-test-with-reflex-to-rna-quantitative-pcr\">HCV RNA<\/a> after a reactive <a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-c-antibody-test-with-reflex-to-rna-quantitative-pcr\">HCV antibody<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">Antibody identification<\/a> and additional immunohematology after a positive RBC screen<\/li>\n\n\n\n<li>A <a href=\"https:\/\/www.ultalabtests.com\/test\/gestational-glucose-tolerance-test-4-specimens-100g\">diagnostic oral glucose tolerance test<\/a> after an elevated <a href=\"https:\/\/www.ultalabtests.com\/test\/glucose-gestational-screen-50g-140-cutoff\">glucose challenge<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">Ferritin<\/a> or <a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">hemoglobinopathy evaluation<\/a> after an abnormal <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a> pattern<\/li>\n\n\n\n<li>Repeat <a href=\"https:\/\/www.ultalabtests.com\/test\/tsh-and-free-t4-test\">thyroid testing<\/a> after medication changes according to the prenatal plan<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">Serial hCG measurements<\/a> for a clinician-defined early-pregnancy question<\/li>\n\n\n\n<li>Diagnostic CVS or amniocentesis after a positive prenatal genetic screen when the patient chooses confirmation<\/li>\n\n\n\n<li>Repeat infection testing after new exposure or at a guideline-directed later pregnancy point<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Repeating a test without knowing what result would change care can create anxiety and conflicting data. Use <a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/how-to-read-lab-results\/\">How to Read and Understand Lab Results<\/a> to review reference intervals, trends, false positives, and confirmatory testing principles.<\/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\">Contact the prenatal team promptly for a positive infection result, positive <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">red-cell antibody screen<\/a>, Rh-negative status with bleeding or trauma, markedly abnormal <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a>, abnormal glucose pathway, concerning thyroid result, repeated contaminated <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">urine cultures<\/a>, or a prenatal genetic screen that is positive, high risk, discordant, or nonreportable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Seek immediate medical care for severe or increasing vaginal bleeding; severe abdominal, pelvic, or shoulder pain; dizziness or fainting; severe headache; vision changes; chest pain; shortness of breath; seizure; fever with serious illness; fluid leakage; severe vomiting with inability to keep fluids down; or fetal movement that has stopped or slowed.<sup><a href=\"#ref-20\">20<\/a><\/sup> Routine laboratory ordering is not the correct response to an emergency.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Explore the Pregnancy and Prenatal Testing Knowledge Center<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/pregnancy-and-fertility\/healthy-pregnancy-prenatal-care-blood-tests\/\">Healthy Pregnancy: Essential Steps, Tests, and Warning Signs<\/a> covers prenatal care, nutrition, medication review, vaccination, and urgent maternal warning signs. It is the broader healthy-pregnancy companion to this laboratory-testing pillar.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/nutrition\/pregnancy-nutrition-whats-safe-and-whats-not\/\">Pregnancy Nutrition: What\u2019s Safe and What\u2019s Not?<\/a> explains nutrition priorities, food safety, and when targeted nutrient testing may be useful.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/pregnancy-and-fertility\/what-happens-to-luteinizing-hormone-during-pregnancy\/\">What Happens to Luteinizing Hormone During Pregnancy?<\/a> explains why <a href=\"https:\/\/www.ultalabtests.com\/test\/lh\">LH<\/a> falls after conception and why <a href=\"https:\/\/www.ultalabtests.com\/test\/lh\">LH<\/a> testing is not a pregnancy-monitoring tool.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/blog\/pregnancy-and-fertility\/fertility-lab-tests\/\">Fertility Lab Tests for Women and Men<\/a> covers ovarian reserve, ovulation, reproductive hormones, male endocrine factors, and preconception testing before pregnancy.<\/li>\n\n\n\n<li><strong>Thyroid Testing in Pregnancy<\/strong> \u2014 proposed focused guide to TSH, <a href=\"https:\/\/www.ultalabtests.com\/test\/t4-free\">free T4<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/thyroid-peroxidase-and-thyroglobulin-antibodies\">thyroid antibodies<\/a>, medication monitoring, and pregnancy-specific interpretation. (planned; add the final URL when published)<\/li>\n\n\n\n<li><strong>Iron and Anemia in Pregnancy<\/strong> \u2014 proposed focused guide to <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a> patterns, <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">ferritin<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-iron-and-total-iron-binding-capacity-panel\">iron studies<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">hemoglobinopathy<\/a>, and treatment follow-up. (planned; add the final URL when published)<\/li>\n\n\n\n<li><strong>Immunity and Titers Before and During Pregnancy<\/strong> \u2014 proposed focused guide to <a href=\"https:\/\/www.ultalabtests.com\/test\/rubella-titer-test\">rubella<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/varicella-immunity-screen\">varicella<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-b-surface-antigen-test-with-reflex-to-confirmation\">hepatitis B<\/a>, vaccine documentation, and exposure follow-up. (planned; add the final URL when published)<\/li>\n\n\n\n<li><strong>Prenatal Genetic Screening<\/strong> \u2014 proposed focused guide to carrier screening, cfDNA, serum screening, <a href=\"https:\/\/www.ultalabtests.com\/test\/maternal-afp-test\">AFP<\/a>, CVS, amniocentesis, residual risk, and counseling. (planned; add the final URL when published)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Related broad guides include <a href=\"https:\/\/www.ultalabtests.com\/blog\/hormone\/womens-hormone-blood-tests\/\">Women\u2019s Hormone Blood Tests<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/blog\/nutrition\/vitamin-nutrient-deficiency-tests\/\">Nutrition, Vitamin, Mineral, and Micronutrient Testing<\/a>, and <a href=\"https:\/\/www.ultalabtests.com\/blog\/infectious-disease\/iinfectious-disease-testing\/\">Infectious Disease, Immunity, Vaccine, and Titer Testing<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Related Individual Tests and Panels<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">These links are educational starting points, not a self-directed prenatal order set. Confirm the current product contents, specimen, preparation, availability, price, and turnaround information on the test page, and coordinate pregnancy-specific use with the prenatal team.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Important:<\/strong> Cell-free DNA\/NIPS, chorionic villus sampling, amniocentesis, and the late-pregnancy vaginal-rectal group B strep swab are discussed for completeness but are not linked as routine self-directed products here. Their selection, timing, specimen collection, interpretation, and follow-up should be coordinated through prenatal care.<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">Common early prenatal laboratory 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> \u2014 evaluates red cells, white cells, and platelets.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/abo-group-and-rh-type\">ABO Group and Rh Type<\/a> \u2014 reports <a href=\"https:\/\/www.ultalabtests.com\/test\/abo-group-and-rh-type\">ABO blood group<\/a> and Rh D status.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">RBC Antibody Screen with Reflex Testing<\/a> \u2014 screens for unexpected red-cell antibodies and may reflex to identification, titer, or antigen typing when indicated.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/urinalysis-ua-complete\">Urinalysis, Complete<\/a> \u2014 provides chemical and microscopic urine findings; it does not replace a <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">urine culture<\/a> for asymptomatic bacteriuria screening.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">Urine Culture<\/a> \u2014 evaluates bacterial growth in urine.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Pregnancy confirmation and defined early-pregnancy questions<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/pregnancy-urine-test\">Pregnancy, Urine Test<\/a> \u2014 qualitative urine testing for hCG.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-qualitative-test\">hCG, Total, Qualitative<\/a> \u2014 reports whether hCG is detected in the submitted blood specimen.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">hCG, Total, Quantitative<\/a> \u2014 reports a numerical hCG concentration; one result does not determine pregnancy viability or location.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Routine infection and immunity tests commonly discussed in prenatal care<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/rubella-titer-test\">Rubella Titer<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/varicella-immunity-screen\">Varicella Immunity Screen<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-b-surface-antigen-test-with-reflex-to-confirmation\">Hepatitis B Surface Antigen with Reflex to Confirmation<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-c-antibody-test-with-reflex-to-rna-quantitative-pcr\">Hepatitis C Antibody with Reflex to RNA Quantitative PCR<\/a><\/li>\n\n\n\n<li><strong>HIV-1\/2 antigen\/antibody testing, fourth generation, with the appropriate confirmatory algorithm<\/strong> \u2014 coordinate assay selection and follow-up with the prenatal clinician.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/rpr-test-with-reflex-to-titer-and-confirmatory-testing\">RPR with Reflex to Titer and Confirmatory Testing<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/chlamydia-and-gonorrhea-test\">Chlamydia and Gonorrhea Test<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Risk-, symptom-, or exposure-directed infection tests<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">These are not a universal self-order list for pregnancy. Selection and timing should follow a defined clinical question.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/quantiferon-tb-gold-plus-tuberculosis-test\">QuantiFERON-TB Gold Plus<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/herpes-simplex-virus-1-and-2-igg-antibody-herpeselect-test-with-reflex-to-hsv-2-inhibition\">Herpes Simplex Virus 1 and 2 IgG Antibody with Reflex to HSV-2 Inhibition<\/a> \u2014 routine HSV-2 serologic screening of asymptomatic pregnant patients is not recommended.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/cytomegalovirus-antibodies-igg-igm\">Cytomegalovirus IgG and IgM Antibodies<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/toxoplasma-igg-igm-antibodies-test\">Toxoplasma IgG and IgM Antibodies<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/parvovirus-b19-igg-igm-antibodies-test\">Parvovirus B19 IgG and IgM Antibodies<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Gestational diabetes pathways and related glucose tests<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The prenatal program must determine which one-step or two-step protocol, dose, cutoff, fasting status, and specimen timing apply. These tests are not interchangeable.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/glucose-gestational-screen-50g-140-cutoff\">Glucose, Gestational Screen, 50 g, 140 Cutoff<\/a> \u2014 one-hour screening option when this cutoff matches the prenatal program.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/gestational-glucose-screen-50g-135-cutoff\">Gestational Glucose Screen, 50 g, 135 Cutoff<\/a> \u2014 alternative one-hour screening option when this cutoff matches the prenatal program.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/gestational-glucose-tolerance-test-4-specimens-100g\">Gestational Glucose Tolerance Test, 4 Specimens, 100 g<\/a> \u2014 commonly used as the diagnostic step in a two-step pathway.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/gestational-glucose-tolerance-test-3-specimens-75g\">Gestational Glucose Tolerance Test, 3 Specimens, 75 g<\/a> \u2014 used in a one-step pathway when selected by the prenatal program.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/glucose\">Standalone Glucose Blood Test<\/a> and <a href=\"https:\/\/www.ultalabtests.com\/test\/a1c-test\">A1C<\/a> \u2014 may answer other metabolic questions but do not replace the gestational-age-specific gestational diabetes pathway.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Targeted anemia, hemoglobinopathy, and thyroid tests<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">Standalone Ferritin Test<\/a><\/li>\n\n\n\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><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">Hemoglobinopathy Evaluation<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/sickle-cell-screen\">Sickle Cell Screen<\/a> \u2014 screening alone may not replace a complete <a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">hemoglobinopathy evaluation<\/a>.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/tsh-and-free-t4-test\">TSH and Free T4<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/t4-free\">Standalone Free T4 Test<\/a> \u2014 usually interpreted with TSH and pregnancy-specific clinical context rather than by itself.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/thyroid-peroxidase-and-thyroglobulin-antibodies\">Thyroid Peroxidase and Thyroglobulin Antibodies<\/a> \u2014 use only when antibodies answer a clinician-defined question.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/t3-free\">Free T3<\/a> \u2014 isolated <a href=\"https:\/\/www.ultalabtests.com\/test\/t3-free\">free T3<\/a> is not a basis for self-adjusting thyroid medication during pregnancy.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Prenatal serum and carrier-screening tests that require coordinated selection<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/maternal-afp-test\">Maternal AFP<\/a> \u2014 requires accurate gestational and pregnancy information and prenatal follow-up.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/cystic-fibrosis-expanded-screen-cfvantage\">Cystic Fibrosis Expanded Carrier Screen<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/spinal-muscular-atrophy-sma-carrier-screen\">Spinal Muscular Atrophy Carrier Screen<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/alpha-globin-gene-deletion-or-duplication\">Alpha-Globin Gene Deletion or Duplication<\/a> \u2014 a molecular option used for selected alpha-thalassemia questions.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Tests discussed only to explain pregnancy-monitoring limitations<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/lh\">Luteinizing Hormone (LH)<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/fsh-test\">Follicle-Stimulating Hormone (FSH)<\/a>, and <a href=\"https:\/\/www.ultalabtests.com\/test\/amh-test-female\">Anti-Mullerian Hormone (AMH)<\/a> may be useful in fertility or endocrine evaluation, but they are not tests for monitoring an established pregnancy.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Panels and category navigation<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/obstetric-panel\">Obstetric Panel<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/ulta-comprehensive-obstetric-prenatal-panel\">ULTA Comprehensive Obstetric-Prenatal Panel<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/testing\/categories\/pregnancy-and-fertility\/prenatal-health\">Prenatal Health Testing Category<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">No panel automatically represents the correct prenatal schedule. Compare every component with the prenatal care plan, avoid duplicate testing, and verify current product contents, specimen requirements, preparation, availability, price, and turnaround information on the product page.<\/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\">Where direct access is available, eligible patients may be able to review selected laboratory options and current pricing online, complete the applicable ordering process, use a participating collection location, and receive results through an online account. Results can then support a more informed conversation with an obstetrician, maternal-fetal medicine specialist, nurse practitioner, certified nurse-midwife, primary-care clinician, endocrinologist, genetic counselor, or other qualified professional.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pregnancy-specific use remains limited by timing, state availability, specimen requirements, test-method differences, and the need for immediate follow-up. Review <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>, <a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/how-to-read-lab-results\/\">How to Read and Understand Lab Results<\/a>, 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> before using a direct-access result.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Questions to Ask a Prenatal Healthcare Professional<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Which blood and urine tests are part of my initial prenatal evaluation, and which results are already documented?<\/li>\n\n\n\n<li>What is my <a href=\"https:\/\/www.ultalabtests.com\/test\/abo-group-and-rh-type\">ABO blood group<\/a>, Rh status, and antibody-screen result?<\/li>\n\n\n\n<li>If I am Rh negative, what events should prompt an immediate call, and what is the Rh immune globulin plan?<\/li>\n\n\n\n<li>Which infection tests are universal, which are risk-based, and which will be repeated later?<\/li>\n\n\n\n<li>Was my <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">urine culture<\/a> collected and resulted, or was only a <a href=\"https:\/\/www.ultalabtests.com\/test\/urinalysis-ua-complete\">urinalysis<\/a> performed?<\/li>\n\n\n\n<li>Do my <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">CBC<\/a> results suggest iron deficiency, <a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">hemoglobinopathy<\/a>, another anemia, or a need for repeat testing?<\/li>\n\n\n\n<li>Has universal <a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">hemoglobinopathy testing<\/a> already been completed, and does my partner need testing?<\/li>\n\n\n\n<li>Which prenatal genetic screening and diagnostic options are available at this gestational age?<\/li>\n\n\n\n<li>What would a positive, negative, or nonreportable prenatal genetic screen change?<\/li>\n\n\n\n<li>Which gestational diabetes pathway does this practice use, and what preparation is required?<\/li>\n\n\n\n<li>Do my history, symptoms, or medications indicate <a href=\"https:\/\/www.ultalabtests.com\/test\/tsh-and-free-t4-test\">thyroid testing<\/a> or closer thyroid monitoring?<\/li>\n\n\n\n<li>Which pregnancy-specific or trimester-specific reference intervals are being used?<\/li>\n\n\n\n<li>Which abnormal results require same-day follow-up?<\/li>\n\n\n\n<li>Will your office accept an outside laboratory result, and could it duplicate testing already ordered?<\/li>\n\n\n\n<li>Which symptoms should lead me to call immediately or go to emergency care?<\/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 blood tests are usually done at the first prenatal visit?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Common early testing includes a <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\/abo-group-and-rh-type\">ABO blood type and Rh factor<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">RBC antibody screen<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/rubella-titer-test\">rubella immunity<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-b-surface-antigen-test-with-reflex-to-confirmation\">hepatitis B<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/hepatitis-c-antibody-test-with-reflex-to-rna-quantitative-pcr\">hepatitis C<\/a>, HIV, and <a href=\"https:\/\/www.ultalabtests.com\/test\/rpr-test-with-reflex-to-titer-and-confirmatory-testing\">syphilis screening<\/a>. A <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">urine culture<\/a> is also commonly performed, and <a href=\"https:\/\/www.ultalabtests.com\/test\/varicella-immunity-screen\">varicella<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/chlamydia-and-gonorrhea-test\">chlamydia<\/a>, gonorrhea, <a href=\"https:\/\/www.ultalabtests.com\/test\/hemoglobinopathy-evaluation\">hemoglobinopathy<\/a>, thyroid, glucose, or other tests may be added according to records, age, history, symptoms, and risk.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is a <a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">quantitative hCG test<\/a> better than a urine pregnancy test?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It answers a different question. A qualitative urine or blood test reports whether <a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">hCG<\/a> is detected. A quantitative blood test reports a concentration and may contribute to a clinician-directed early-pregnancy evaluation. One numerical result cannot prove viability or locate the pregnancy.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can <a href=\"https:\/\/www.ultalabtests.com\/test\/hcg-total-quantitative-test\">hCG levels<\/a> tell exactly how many weeks pregnant I am?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. hCG values overlap widely. Gestational dating relies on menstrual and conception information when reliable and, importantly, prenatal ultrasound. hCG may provide supporting information in selected early-pregnancy situations but should not be used as an exact pregnancy clock.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why are <a href=\"https:\/\/www.ultalabtests.com\/test\/abo-group-and-rh-type\">ABO type<\/a>, Rh factor, and an <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">antibody screen<\/a> all needed?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">ABO and Rh type describe red-cell antigens. The <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">antibody screen<\/a> looks for maternal antibodies that could react with fetal red cells. Rh-negative status does not mean an antibody is present, and Rh-positive patients can still have non-D antibodies.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is a positive prenatal <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">antibody screen<\/a> the same as Rh incompatibility?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. The antibody must be identified, and its clinical significance depends on the antigen, strength or titer, prior history, and fetal antigen status. The prenatal team determines whether specialized monitoring is needed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does a Normal <a href=\"https:\/\/www.ultalabtests.com\/test\/urinalysis-ua-complete\">Urinalysis<\/a> Rule Out Asymptomatic Bacteriuria?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. <a href=\"https:\/\/www.ultalabtests.com\/test\/urinalysis-ua-complete\">Urinalysis<\/a> may miss asymptomatic bacteriuria, and contamination can complicate interpretation. <a href=\"https:\/\/www.ultalabtests.com\/test\/urine-culture-test\">Urine culture<\/a> is the established screening method during pregnancy.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">When is the pregnancy glucose test performed?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.ultalabtests.com\/test\/glucose-gestational-screen-50g-140-cutoff\">Gestational diabetes screening<\/a> is commonly performed between 24 and 28 weeks. Earlier testing may be used for a different question, such as previously unrecognized diabetes, when the prenatal team identifies a reason.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Do I need to fast for the gestational diabetes test?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It depends on the test. The one-hour glucose challenge used for screening in many practices is generally nonfasting. A <a href=\"https:\/\/www.ultalabtests.com\/test\/gestational-glucose-tolerance-test-4-specimens-100g\">diagnostic oral glucose tolerance test<\/a> requires fasting and timed samples. Follow the exact instructions from the prenatal program.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does Every Pregnant Patient Need Routine Thyroid-Function Testing?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Not necessarily. <a href=\"https:\/\/www.ultalabtests.com\/test\/tsh-and-free-t4-test\">Thyroid testing<\/a> is especially relevant for known thyroid disease, medication use, symptoms, <a href=\"https:\/\/www.ultalabtests.com\/test\/thyroid-peroxidase-and-thyroglobulin-antibodies\">thyroid antibodies<\/a>, autoimmune disease, goiter, prior thyroid treatment, or other risk factors. The prenatal clinician should determine the test and interval.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-test\">ferritin<\/a> routinely required in every pregnancy?<\/h3>\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<\/a> is commonly used, while <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-iron-and-total-iron-binding-capacity-panel\">ferritin or broader iron studies<\/a> are often targeted to anemia, low red-cell indices, symptoms, diet, blood loss, prior deficiency, or treatment monitoring. Guidance and practice vary for asymptomatic universal iron-deficiency screening.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is the difference between prenatal genetic screening and diagnostic testing?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Screening estimates the chance of selected conditions. Cell-free DNA, serum screening, and <a href=\"https:\/\/www.ultalabtests.com\/test\/maternal-afp-test\">AFP<\/a> are screening tests. CVS and amniocentesis are diagnostic procedures for the conditions tested. A positive screen should be evaluated with counseling and, when chosen, diagnostic confirmation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can I order cell-free DNA screening on my own?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Prenatal cfDNA should be selected through prenatal care because correct gestational age, pregnancy type, prior screening, ultrasound findings, what the panel covers, and the plan for positive or nonreportable results all matter. The FDA emphasizes that NIPS is screening, not diagnosis.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why might infection tests be repeated later in pregnancy?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A negative early test does not protect against later exposure. Repeat testing may be recommended because of current ACOG guidance, personal risk, a new partner or exposure, a prior positive result, local epidemiology, state requirements, or presentation late to care.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does a panel include every test needed for prenatal care?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. Panel components differ, may duplicate completed testing, and may omit gestational-age-specific screening, ultrasound, swab collection, or clinician-only procedures. A panel should be compared with the prenatal plan component by component.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">When should pregnancy symptoms bypass routine lab testing?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Severe bleeding, severe abdominal or pelvic pain, shoulder pain, fainting, severe headache, vision changes, chest pain, trouble breathing, fluid leakage, seizure, serious fever, or reduced fetal movement requires immediate clinical assessment. Do not wait for a routine lab result.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Main Takeaways<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pregnancy blood tests and prenatal urine tests provide important information about maternal <a href=\"https:\/\/www.ultalabtests.com\/test\/complete-blood-count-with-differential-and-platelets-cbc-test\">blood counts<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/abo-group-and-rh-type\">blood type and Rh factor<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/antibody-screen-rbc-with-reflex-to-identification-titer-and-antigen-typing\">red-cell antibodies<\/a>, urine bacteria, immunity, infections, glucose regulation, thyroid function, <a href=\"https:\/\/www.ultalabtests.com\/test\/ferritin-iron-and-total-iron-binding-capacity-panel\">iron status<\/a>, and inherited blood conditions. Prenatal genetic blood tests can estimate probability, but they do not replace diagnostic procedures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The value of each result depends on why it was ordered, the gestational window, the exact method, pregnancy-specific reference information, prior results, symptoms, medications, and the follow-up plan. Direct-access testing may support selected questions, but it cannot replace prenatal visits, ultrasound, blood-pressure assessment, fetal monitoring, genetic counseling, treatment, or urgent care.<\/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.acog.org\/womens-health\/faqs\/routine-tests-during-pregnancy\">Routine Tests During Pregnancy<\/a>. American College of Obstetricians and Gynecologists. Accessed August 7, 2026.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.uspreventiveservicestaskforce.org\/uspstf\/recommendation\/asymptomatic-bacteriuria-in-adults-screening\">Asymptomatic Bacteriuria in Adults: Screening<\/a>. U.S. Preventive Services Task Force. September 24, 2019.<\/li>\n\n\n\n<li><a href=\"https:\/\/medlineplus.gov\/lab-tests\/pregnancy-test\/\">Pregnancy Test<\/a>. MedlinePlus, U.S. National Library of Medicine. Updated September 25, 2025.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.uspreventiveservicestaskforce.org\/uspstf\/recommendation\/syphilis-infection-in-pregnancy-screening\">Syphilis Infection During Pregnancy: Screening<\/a>. U.S. Preventive Services Task Force. May 13, 2025.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.uspreventiveservicestaskforce.org\/uspstf\/recommendation\/human-immunodeficiency-virus-hiv-infection-screening\">Human Immunodeficiency Virus Infection: Screening<\/a>. U.S. Preventive Services Task Force. June 11, 2019.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.uspreventiveservicestaskforce.org\/uspstf\/recommendation\/hepatitis-b-virus-infection-in-pregnant-women-screening\">Hepatitis B Virus Infection in Pregnant Women: Screening<\/a>. U.S. Preventive Services Task Force. July 23, 2019.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.cdc.gov\/std\/treatment-guidelines\/screening-recommendations.htm\">STI Screening Recommendations<\/a>. Centers for Disease Control and Prevention. Accessed August 7, 2026.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.uspreventiveservicestaskforce.org\/uspstf\/recommendation\/gestational-diabetes-screening\">Gestational Diabetes: Screening<\/a>. U.S. Preventive Services Task Force. August 10, 2021.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.cdc.gov\/hepatitis-c\/hcp\/diagnosis-testing\/index.html\">Clinical Screening and Diagnosis for Hepatitis C<\/a>. Centers for Disease Control and Prevention. Accessed August 7, 2026.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.acog.org\/clinical\/clinical-guidance\/practice-advisory\/articles\/2026\/01\/screening-for-fetal-chromosomal-abnormalities\">Screening for Fetal Chromosomal Abnormalities<\/a>. American College of Obstetricians and Gynecologists. January 2026.<\/li>\n\n\n\n<li><a href=\"https:\/\/medlineplus.gov\/lab-tests\/prenatal-cell-free-dna-screening\/\">Prenatal Cell-Free DNA Screening<\/a>. MedlinePlus, U.S. National Library of Medicine. Updated March 19, 2024.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.fda.gov\/medical-devices\/in-vitro-diagnostics\/laboratory-developed-tests\">FDA laboratory-developed tests hub (includes archived NIPS safety communication)<\/a>. U.S. Food and Drug Administration. April 19, 2022.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.acog.org\/womens-health\/faqs\/prenatal-genetic-diagnostic-tests\">Prenatal Genetic Diagnostic Tests<\/a>. American College of Obstetricians and Gynecologists. Accessed August 7, 2026.<\/li>\n\n\n\n<li><a href=\"https:\/\/medlineplus.gov\/lab-tests\/alpha-fetoprotein-afp-test\/\">Alpha-Fetoprotein Test<\/a>. MedlinePlus, U.S. National Library of Medicine. Updated December 19, 2024.<\/li>\n\n\n\n<li><a href=\"https:\/\/medlineplus.gov\/lab-tests\/red-blood-cell-antibody-screen\/\">MedlinePlus guidance on red-cell antibody testing<\/a>. MedlinePlus, U.S. National Library of Medicine. Accessed August 7, 2026.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.acog.org\/womens-health\/faqs\/the-rh-factor-how-it-can-affect-your-pregnancy\">The Rh Factor: How It Can Affect Your Pregnancy<\/a>. American College of Obstetricians and Gynecologists. Accessed August 7, 2026.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.uspreventiveservicestaskforce.org\/uspstf\/recommendation\/iron-deficiency-anemia-in-pregnant-women-screening-and-supplementation\">Iron Deficiency and Iron Deficiency Anemia During Pregnancy: Screening and Supplementation<\/a>. U.S. Preventive Services Task Force. August 20, 2024.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.cdc.gov\/group-b-strep\/testing\/index.html\">Screening for Group B Strep Bacteria<\/a>. Centers for Disease Control and Prevention. May 1, 2025.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.cdc.gov\/vaccines-pregnancy\/hcp\/vaccination-guidelines\/index.html\">Guidelines for Vaccinating Pregnant Women<\/a>. Centers for Disease Control and Prevention. Updated August 22, 2025.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.cdc.gov\/hearher\/maternal-warning-signs\/index.html\">Urgent Maternal Warning Signs and Symptoms<\/a>. Centers for Disease Control and Prevention. May 15, 2024.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.thyroid.org\/professionals\/ata-professional-guidelines\/\">American Thyroid Association 2026 Guidelines for Thyroid Disease in Preconception, Pregnancy, and Postpartum<\/a>. American Thyroid Association. <em>Thyroid<\/em>. 2026;36(5):481-544.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.acog.org\/clinical\/clinical-guidance\/practice-advisory\/articles\/2022\/08\/hemoglobinopathies-in-pregnancy\">Hemoglobinopathies in Pregnancy<\/a>. American College of Obstetricians and Gynecologists. August 2022.<\/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>Pregnancy blood tests and prenatal urine tests are used for several different purposes. Early testing commonly evaluates pregnancy hormone status when needed, blood counts, blood type and Rh factor, unexpected red-cell antibodies, urine bacteria, immunity [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"om_disable_all_campaigns":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[26,27,81,87,276,173,175,24,4981,4980,216,211,248,206,257,268,263,269,201,185,267,203,287],"tags":[5448,5430,5460,5464,5438,3272,3248,5455,5462,5427,5461,5449,5407,5472,2170,5435,3247,3219,5444,5443,5413,621,5463,5429,5425,5433,5446,3244,1326,5470,5457,5471,5458,3216,5451,5452,5387,3246,5434,5445,3235,3227,5467,5465,5426,5447,5437,5441,3225,5454,5456,3256,5422,3222,5424,5469,5428,5432,5423,3252,5431,5408,5439,5459,5466,3259,5436,5453,5442,5468,5450,3280,3274,5440,5418],"class_list":["post-2971","post","type-post","status-publish","format-standard","hentry","category-all-anemia","category-anemia","category-diabetes","category-all-diabetes","category-fertility-for-women","category-immunity-and-titer","category-all-immunity-and-titer","category-iron-deficiency-anemia","category-lab-testing-knowledge-center-lab-testing-knowledge-center","category-lab-testing-knowledge-center","category-micronutrients-nutrition","category-nutrition","category-all-nutrition","category-pregnancy-and-fertility","category-all-pregnancy-and-fertility","category-pregnancy-third-trimester-28-weeks-to-delivery","category-prenatal-health","category-all-std","category-std","category-stds","category-thyroid-health","category-womens-health","category-all-womens-health","tag-a1c-in-pregnancy","tag-abo-blood-type","tag-alpha-thalassemia-screening","tag-amniocentesis","tag-anemia-in-pregnancy","tag-asymptomatic-bacteriuria-pregnancy","tag-blood-type-pregnancy","tag-carrier-screening-pregnancy","tag-cell-free-dna-screening","tag-chlamydia-pregnancy","tag-chorionic-villus-sampling","tag-cmv-pregnancy-testing","tag-cystic-fibrosis-carrier-screening","tag-direct-access-lab-testing-pregnancy","tag-ferritin-test","tag-first-trimester-tests","tag-free-t4-pregnancy","tag-gestational-diabetes-screening","tag-glucose-challenge-test","tag-gonorrhea-pregnancy","tag-hcg-test","tag-healthy-pregnancy","tag-hemoglobinopathy-screening","tag-hepatitis-b-pregnancy","tag-hepatitis-c-pregnancy","tag-hiv-testing-pregnancy","tag-immunity-titers-pregnancy","tag-iron-deficiency-pregnancy","tag-iron-studies","tag-maternal-health-testing","tag-maternal-serum-afp","tag-maternal-fetal-medicine","tag-nipt","tag-obstetric-panel","tag-oral-glucose-tolerance-test-pregnancy","tag-parvovirus-b19-pregnancy","tag-preconception-testing","tag-pregnancy-blood-tests","tag-pregnancy-cbc","tag-pregnancy-glucose-test","tag-pregnancy-lab-tests","tag-pregnancy-nutrition","tag-pregnancy-reference-ranges","tag-pregnancy-test-preparation","tag-pregnancy-testing-timeline","tag-pregnancy-thyroid-tests","tag-prenatal-antibody-screen","tag-prenatal-blood-tests","tag-prenatal-care","tag-prenatal-diagnostic-testing","tag-prenatal-genetic-screening","tag-prenatal-infection-screening","tag-prenatal-lab-testing","tag-prenatal-panel","tag-prenatal-screening-tests","tag-prenatal-test-interpretation","tag-qualitative-hcg","tag-quantitative-hcg","tag-red-blood-cell-antibodies","tag-rh-factor-pregnancy","tag-rh-incompatibility","tag-rubella-immunity","tag-second-trimester-tests","tag-sickle-cell-screening","tag-spinal-muscular-atrophy-carrier-screening","tag-syphilis-screening-pregnancy","tag-third-trimester-tests","tag-thyroid-antibodies-pregnancy","tag-toxoplasmosis-testing-pregnancy","tag-trimester-specific-reference-ranges","tag-tsh-in-pregnancy","tag-urinalysis-pregnancy","tag-urine-culture-pregnancy","tag-urine-pregnancy-test","tag-varicella-immunity"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.1 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Pregnancy Blood Tests and Prenatal Screening: hCG, Genetic Screening, and Tests by Trimester | Ulta Lab Tests<\/title>\n<meta name=\"description\" content=\"Pregnancy blood tests, prenatal blood tests, and prenatal screening tests explained by trimester, purpose, preparation and clinical guidance.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ultalabtests.com\/blog\/pregnancy-and-fertility\/pregnancy-blood-tests-prenatal-screening\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pregnancy Blood Tests and Prenatal Screening: hCG, Genetic Screening, and Tests by Trimester\" \/>\n<meta property=\"og:description\" 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