Lab test

Folic Acid Lab Test - B12 Deficiency Test

This test measures vitamin B12 and folic acid (folate) levels in the blood.

Typical price

From $118

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

This test measures vitamin B12 and folic acid (folate) levels in the blood. Both are B vitamins that play key roles in DNA synthesis and in producing red blood cells. Low levels can lead to a type of anemia and may affect energy and nerve function. The test is often ordered for fatigue, tingling in the hands or feet, a low red blood cell count, or when a person has a diet or digestive condition that limits absorption. It can also be used to follow up on abnormal blood counts.

• Vitamin B12 Measures the level of this B vitamin, which supports red blood cells and nerves.
• Folic acid (folate) Measures the level of this B vitamin, which is important for DNA synthesis and red blood cell production.

• People with fatigue, weakness, or tingling sensations
• Individuals with anemia or unusually large red blood cells
• People with diets low in animal products or with malabsorption conditions
• Those taking medicines that affect B vitamin levels
• People being evaluated for a nutritional deficiency

• Fasting may be requested for some panels.
• Tell the collector about vitamin supplements or medicines you take.
• Follow any instructions provided for your specific panel.

Low vitamin B12 or folate can help explain certain types of anemia and may relate to fatigue or nerve symptoms. High levels are usually related to supplements rather than a deficiency. Because the two vitamins interact and symptoms overlap, results are best read together. Discuss results with a healthcare provider, who can interpret them with your blood count and history.

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