Vitamin B12 Deficiency and Folate Deficiency

A diagnosis of vitamin B12 or folate deficiency anemia can often be made based on your symptoms and the results of vitamin b12 tests. If you have symptoms of Vitamin B12 and folate deficiency, it's essential to get tested. Learn about the different types of blood tests here.    

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The Folate RBC Test measures folate levels inside red blood cells, providing a more accurate reflection of long-term folate status than serum tests. Folate is essential for DNA synthesis, red blood cell production, and nervous system health. Low levels may indicate poor diet, malabsorption, or anemia. Doctors order this test for patients with fatigue, weakness, or neurological issues. Results help diagnose folate deficiency and guide nutritional treatment.

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Blood Draw
Also Known As: RBC Folic Acid Test, Vitamin B9 RBC Test, Folate Test

The Antioxidants Micronutrients Panel measures key antioxidants; Alpha Tocopherol, Beta Gamma Tocopherol, Coenzyme Q10, Vitamin A, and Vitamin C to evaluate the body’s defense against oxidative stress. These nutrients support immune health, cellular protection, energy production, and overall wellness. The test helps detect deficiencies or imbalances that may affect long-term health and disease prevention.

Patient must be 18 years of age or older.
Also Known As: Antioxidants Test

The Folate Micronutrient Test measures blood folate levels to assess nutritional status and detect deficiencies. Folate is essential for DNA synthesis, red blood cell production, and proper fetal development. This test helps identify dietary insufficiency, malabsorption issues, or increased nutrient needs, supporting the diagnosis and management of anemia, pregnancy health, and overall wellness.

Patient must be 18 years of age or older.
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Blood Draw
Also Known As: Serum Folic Acid Test, Vitamin B9 Test

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The Folate Serum Test measures folate (vitamin B9) levels in blood to evaluate nutritional status and overall health. Low folate may cause anemia, fatigue, weakness, or pregnancy complications, while high levels may reflect supplementation. Doctors order this test to investigate unexplained anemia, monitor prenatal health, or assess dietary deficiencies. It provides valuable insight into red blood cell production, metabolism, and nutritional balance.

Blood
Blood Draw
Also Known As: Serum Folic Acid Test, Vitamin B9 Test, Folate Test

The Vitamin B12 Micronutrient Test measures blood levels of vitamin B12, essential for red blood cell production, nerve health, and DNA synthesis. Deficiency can cause anemia, fatigue, neurological issues, and cognitive changes. This test helps identify dietary deficiencies, absorption problems, or related health conditions, supporting diagnosis and ongoing management of overall wellness.

Patient must be 18 years of age or older.
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Blood Draw
Also Known As: B12 Test, Cobalamin Test

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The Vitamin B12 Test measures cobalamin levels in blood to evaluate nutritional health, red blood cell production, and nervous system function. Low B12 can cause anemia, fatigue, weakness, memory problems, and nerve damage, while high levels may indicate liver or kidney disease. Doctors use this test to detect B12 deficiency, monitor treatment, and assess malabsorption conditions like pernicious anemia, Crohn’s disease, or celiac disease.

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Blood Draw
Also Known As: B12 Test, Cobalamin Test

The Vitamin B12 and Folate Panel Test measures blood levels of vitamin B12 and folate to evaluate nutritional status, red blood cell production, and nervous system health. Deficiencies may cause anemia, fatigue, weakness, neuropathy, or cognitive decline, while elevated levels can indicate liver or kidney disease. Doctors use this panel to diagnose deficiency, monitor therapy, and assess absorption disorders such as pernicious anemia, Crohn’s disease, or celiac disease.

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Blood Draw
Also Known As: Cobalamin and Folic Acid Test, Vitamin B12 and Vitamin B9 Test

The Complete Blood Count with Differential and Platelets Test is a comprehensive blood test that checks red blood cells, white blood cells, hemoglobin, hematocrit, and platelets. The differential analyzes types of white blood cells to detect infections, anemia, clotting abnormalities, immune conditions, and certain cancers. This essential test is often ordered for routine health exams, diagnosis, and monitoring treatment progress.

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Blood Draw
Also Known As: CBC Test, CBC with Differential and Platelets Test, CBC w/Diff and Platelets Test, Full Blood Count Test, Complete Blood Count Test

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The Homocysteine Test measures homocysteine levels in blood to assess risk for heart disease, stroke, and vascular problems. Elevated homocysteine may result from vitamin B6, B12, or folate deficiency and is linked to blood clots, cognitive decline, and osteoporosis. Doctors use this test to evaluate cardiovascular risk, monitor nutritional deficiencies, and guide treatment for metabolic or genetic conditions affecting homocysteine metabolism.

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Blood Draw
Also Known As: Homocysteine Cardiac Risk Test

The Intrinsic Factor Blocking Antibody Test detects antibodies that interfere with intrinsic factor, a protein essential for vitamin B12 absorption. The presence of these antibodies is strongly associated with pernicious anemia, an autoimmune cause of B12 deficiency. Doctors use this blood test to help confirm diagnosis, distinguish the cause of anemia, and guide treatment for patients experiencing fatigue, weakness, or neurological symptoms related to low B12.

Also Known As: Intrinsic Factor Antibody Test, IF Antibody Test, IF Antibody Type 1 Test, IF Antibody Type 2 Test,

The Methylmalonic Acid (MMA) Blood Test measures MMA levels in the bloodstream to help detect vitamin B12 deficiency, often before anemia or neurological symptoms appear. Elevated results may indicate poor B12 absorption, pernicious anemia, or metabolic disorders. Doctors order this test when patients present with fatigue, neuropathy, or unexplained anemia. Results provide early insight into nutritional status, metabolic health, and treatment needs.

Blood
Blood Draw
Also Known As: MMA Test

The Methylmalonic Acid Urine Test measures MMA levels to help detect vitamin B12 deficiency and assess metabolic health. Elevated MMA indicates impaired B12-dependent enzyme function, which may lead to anemia or nervous system damage. Doctors order this test to investigate unexplained fatigue, weakness, or neurological symptoms. It is often used with serum B12 testing for early, accurate detection and monitoring of deficiency.

Urine
Urine Collection
Also Known As: MMA Urine Test

The Parietal Cell Antibody Test detects autoantibodies against stomach parietal cells, which produce intrinsic factor and stomach acid. Their presence is strongly associated with pernicious anemia, vitamin B12 deficiency, and autoimmune gastritis. Doctors use this blood test to help diagnose the cause of anemia, investigate digestive issues, and evaluate patients with suspected autoimmune disorders affecting stomach function and nutrient absorption.

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Blood Draw
Also Known As: Gastric Parietal Cell Antibody Test, Anti-Parietal Cell Antibody Test, Anti-GPA Test, AGPA Test, APCA Test

The Reticulocyte Count Test measures immature red blood cells (reticulocytes) to evaluate bone marrow function and red cell production. High levels may indicate blood loss, hemolytic anemia, or recovery from treatment, while low levels may suggest bone marrow failure, nutritional deficiencies, or chronic disease. Doctors use this test to assess anemia, monitor therapy, or track recovery. Results provide key insight into red blood cell health and overall hematologic function.

Blood
Blood Draw
Also Known As: Retic Count Reticulocyte Percent Test, Reticulocyte Index Test, Corrected Reticulocyte Test, Reticulocyte Production Index Test, RPI Test

The Vitamin C Micronutrient Test measures blood levels of ascorbic acid to assess nutritional status and detect deficiencies. Vitamin C is vital for immune defense, collagen formation, wound healing, and antioxidant protection. This test helps identify poor dietary intake, absorption issues, or increased needs due to illness or stress, supporting diagnosis and management of overall health.

Patient must be 18 years of age or older.
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Blood Draw
Also Known As: Ascorbic Acid Test

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The Vitamin C Test measures blood levels of vitamin C (ascorbic acid), an essential nutrient for immune defense, wound healing, collagen production, and antioxidant protection. Low levels may indicate poor diet, malabsorption, or scurvy, while high levels may occur with excess supplementation. Doctors order this test for patients with fatigue, bleeding gums, or poor wound healing. Results help assess nutritional status and guide treatment or dietary adjustments.

Blood
Blood Draw
Also Known As: Ascorbic Acid Test

The B Vitamins Micronutrients Test Panel measures levels of Folate, B1, B2, B3, B5, B6, and B12 to evaluate nutritional status and detect deficiencies. B vitamins are essential for energy production, metabolism, red blood cell formation, nervous system health, and DNA synthesis. This panel helps identify imbalances from poor diet, malabsorption, or increased nutrient needs, supporting overall health management.

Patient must be 18 years of age or older.

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9 Blood Tests to Help Identify Vitamin B12 and Folate Deficiency

Are you feeling tired, sluggish, or irritable? Have you noticed changes in your digestion? You could be dealing with a vitamin deficiency. 

The majority of people in the United States consume adequate levels of B12 and folate. However, it's estimated that three percent of men and eight percent of women are deficient. 

A vitamin deficiency can come with a number of consequences. It's important to keep an eye on odd symptoms you're experiencing in case you could be a part of the three or eight percent.

If you're looking for a vitamin B12 deficiency test, you'll benefit from having some background information on the deficiency, its symptoms, treatments, etc. So keep reading to learn more. 

What Are Vitamin B12 and Folate?

Along with folate and vitamin C, vitamin B12, also called cobalamin, helps the body make new proteins. The proteins make red and white blood cells, repair cells, and synthesize DNA.

Vitamin B12 is not naturally produced in the body. Therefore, a person needs to get the right amount from their diet. Red meat, fish, poultry, milk, yogurt, and eggs contain cobalamin.

Folate is also a vitamin the body does not make naturally. It's especially important during pregnancy for cell division. It's commonly found in leafy green vegetables, peas and dry beans, liver, yeast, and citrus fruits. 

So, what causes vitamin B12 deficiency? When someone is dealing with a vitamin B12 deficiency, it's most often because they're not getting enough through their diet or supplements.

When it comes to dietary deficiencies, vegans are the most likely to suffer because of the lack of animal products. However, dietary deficiencies are not the only reason people may develop a B12 deficiency. 

Two other reasons someone may be suffering from vitamin B12 deficiency symptoms are inadequate absorption and increased need. If the vitamin B12 absorption process stops, that can cause the body to absorb less than what it needs. In regard to increased need, some diseases and conditions, like pregnancy or cancer, can boost the need for B12. 

Signs and Symptoms of Vitamin B12 and Folate Deficiency 

In some cases, a mild vitamin B12 and folate deficiency causes no symptoms. Minor changes in diet could fix the issue because a person even realizes something is off. As the deficiency worsens, however, the signs and symptoms become significantly more noticeable. 

Some of the most common signs and symptoms of a vitamin B12 deficiency include the following: 

  • Diarrhea
  • Constipation 
  • Dizziness 
  • Fatigue 
  • Muscle weakness 
  • Loss of appetite 
  • Pale skin 
  • Rapid heart rate
  • Irregular heartbeats 
  • Shortness of breath 
  • Sore or smooth tongue and month 
  • Tingling, numbness, and/or burning in the feet, hands, arms, and legs 
  • Paranoia 
  • Irritability 
  • Vision loss 
  • Weight loss 
  • Unsteady movements 
  • Mental confusion 

If you notice signs of a vitamin B12 deficiency, it's important to learn about the blood tests that can confirm or deny your suspected problem. While you may think you need to head to the doctor to get that done, you have online testing options from Ulta Lab Tests to make the process easier.

Consequences of an Untreated Vitamin B12 Deficiency

If a vitamin B12 deficiency goes untreated, there are several potential consequences. The most common is anemia. When your body doesn't make enough red blood cells, you won't have enough oxygen to your tissues and organs. Untreated anemia can result in heart failure. 

Anemia can also cause nerve problems. This is because B12 helps your body produce myelin. Myelin is essentially a protective layer throughout your nervous system. When those layers break down, nerve fibers can get damaged, which can cause numbness. Left untreated, paralysis is possible. 

A vitamin B12 deficiency can also cause mental health issues like depression, anxiety, insomnia, confusion, and visual or audio hallucinations. In extreme cases, patients can experience extrapyramidal symptoms where the body moves uncontrollably. 

Some doctors and scientists believe there is also a connection between B12 deficiencies and brain issues like dementia and Alzheimer's disease. The brain naturally shrinks with age, but depleted B12 can speed up the process by increasing the level of amino acids in the brain. 

Unfortunately, that's not where the consequences stop. Some rarer conditions related to B12 and folate deficiency include infertility, osteoporosis, COPD, and infertility. 

Blood Tests for Vitamin B12 and Folate Deficiency 

If it's suspected you have a vitamin B12 deficiency, there are a number of blood tests that can confirm or deny the suspicion. Folate is typically tested simultaneously, as the signs and symptoms of both deficiencies are similar. 

Does vitamin B12 deficiency show in blood tests? The short answer is yes. There are, however, a number of tests that can be used. Let's take a look at the nine types of blood tests used to diagnose vitamin B12 and folate deficiencies. 

1) Vitamin B12

vitamin B12 test is used to diagnose conditions like anemia and other autoimmune diseases. In addition, in the elderly, the test can help determine the cause of an altered mental state. If a person suffers from a B12 deficiency, their doctor will likely order the test over time to see if the established treatment is effective. 

2) Folate 

While folate is a separate blood test, it is often used together with B12. In addition to detecting illnesses, testing folate levels can provide a general overview of a person's health and nutritional status. 

3) CBC

A CBC, also known as a complete blood count, is used to screen for many conditions and diseases that affect blood cells. The test evaluates red blood cells, white blood cells, and platelets. 

Red blood cells contain hemoglobin, which is the protein that transports oxygen throughout the body. While most red blood cells last 120 days, medical conditions can change that. When a person has vitamin B12 and folate deficiencies, their red blood cells appear abnormal in size and shape.

White blood cells are a crucial part of the body's immune system. So if the body is fighting an infection or inflammation, the numbers will come back abnormal. 

Platelets are cell fragments that assist with clotting. People who have diseases that cause low platelets are at risk of excessive bleeding and bruising. 

4) B Vitamins 

B vitamins are required for metabolism and energy. They're also needed for cell, skin, bone, muscle, organ, and nervous system health. B vitamins are water-soluble, which means you have to eat foods rich in B vitamins to meet your body's needs. 

When you get tested for B vitamins, your doctor will review your levels for thiamine (B1), riboflavin (B2), niacin (B3), pantothenic acid (B5), pyridoxal phosphate (B6), biotin (B7), folate (B9), and cobalamin (B12). 

In regard to test results, low levels could indicate a B vitamin deficiency, and high levels can be associated with vitamin toxicity. 

5) Methylmalonic Acid

Testing methylmalonic acid can detect early or mild vitamin B12 deficiency. The acid is needed for metabolism and energy production. As methylmalonic acid rises in your blood, vitamin B12 levels decrease. 

While the body has measures to level the two out, someone with malabsorption issues could experience numbness, swelling, and jaundice. 

6) Homocysteine

Homocysteine is an amino acid. It is present in all cells of the body and is quickly converted into other products. Vitamin B12 and folate, along with B6, are needed to metabolize homocysteine. 

If a blood test reveals homocysteine levels are elevated, the patient could have a B12 deficiency. Additional testing will be needed to get to the root of the problem. 

Higher levels of homocysteine can also indicate a higher risk for stroke, atherosclerosis, coronary heart disease, or peripheral vascular disease. 

7) Intrinsic Factor Antibody 

Intrinsic factor antibodies are proteins made by the immune system. The protein is produced by specialized cells in the lining of the stomach wall. 

During digestion, stomach accidents release vitamin B12 and bind to intrinsic factor antibodies. With an intrinsic factor, vitamin B 12 goes unabsorbed, and a person can develop anemia. 

8) Parietal Cell Antibody 

Parietal cell antibodies are proteins produced by the immune system. The antibodies mistakenly target cells that line the stomach wall. 

You could have this test completed if you or your doctor believes you have pernicious anemia. Pernicious anemia is an autoimmune disease that flares when the body's immune system targets its own tissues. 

9) Gastrin 

Gastrin, produced by the G-cells, is a hormone that's part of the stomach's antrum. This blood test is usually used to evaluate recurrent peptic ulcers and other types of severe abdominal pain or symptoms. 

While this test isn't directly used to diagnose a vitamin B12 deficiency, its results can help you decide your next step. 

gastrin test is commonly used when a patient suffers from diarrhea, abdominal pain, peptic ulcers, and fatigue. 

While most vitamin B12 and folate deficiencies can be identified with tests at the top of the list, you may need additional testing if your results are unclear. 

With the number of tests Ulta Lab Tests offers, you'll be on track to understanding your body's needs in no time. Test results come as quickly as one to two days, so you won't have to wait weeks to find out if you have a deficiency that needs to be addressed. 

Understanding the Results of a Vitamin B12 Deficiency Test 

If your test results confirm you have a vitamin B12 deficiency, you may need to undergo additional testing to reach a diagnosis. 

It's important to note that dietary deficiency of B12 or folate is uncommon in the United States. This is because many foods are fortified with vitamins. 

In some instances, you could have a deficiency because of certain medications. If your test results indicate that, you can talk with your doctor about finding a new treatment method or adding supplements to your diet. 

Treating a Vitamin B12 Deficiency 

In most instances, treating vitamin deficiencies involves changes in diet and adding supplements. 

For a folate deficiency, folic acid supplements are often suggested. However, once the body's folate level is where it needs to be, which can be confirmed with follow-up blood tests, you'll likely be able to stop taking the supplements. 

With a B-12 deficiency, patients usually start with oral supplements, but that's not always enough. If blood tests do not show any improvements with traditional supplements, B12 injections are an option. 

But how long does it take to recover from B12 deficiency? That answer depends on how well you follow your treatment plan and how your body responds. 

If blood tests confirm you have a vitamin B12 and folate deficiency, you'll want to consider asking your doctor questions about your condition and treatment options. Some of the most common questions, and their answers, patients ask include the following: 

Is vitamin B12 deficiency dangerous?

If left untreated, a B12 deficiency can cause serious complications. 

Does vitamin B12 deficiency cause memory loss?

Yes, vitamin B12 deficiency can cause memory loss. 

Can vitamin B12 deficiency cause muscle pain?

Yes, vitamin B12 deficiency can cause muscle pain. 

Can vitamin B12 deficiency cause lightheadedness?

Yes, vitamin B12 deficiency can cause lightheadedness, particularly when a person stands up too quickly. 

Can vitamin B12 deficiency cause insomnia?

Insomnia and fatigue are the most common and debilitating symptoms related to vitamin B12 deficiency. 

Can vitamin B12 deficiency cause fever?

A severe vitamin B12 deficiency can cause a fever. 

Can vitamin B12 deficiency cause dizziness?

Frequent dizziness and vertigo can indicate a vitamin B12 deficiency. 

Cause vitamin B12 deficiency cause diabetes?

No, but diabetes can increase your risk of having a B12 deficiency. 

Can rheumatoid arthritis cause vitamin B12 deficiency? 

Not necessarily, but a portion of patients with RA do have vitamin B12 deficiency. 

Once you have a handle on your vitamin deficiency, you'll be able to get back to living a high-quality life. 

Order Lab Tests Online

For many patients, driving to a hospital or medical facility for bloodwork can be time-consuming and costly. Fortunately, Ulta Lab Tests offers vitamin B12 deficiency test options. 

When you order lab work from Ulta Lab Tests, your results are kept secure and confidential. And you won't have to worry about getting a referral from your doctor, either. We also offer the lowest prices on lab tests, so health insurance isn't a problem if you're not covered. 

If you're ready to take control of your health, contact us today.