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Vitamin B12 and Folate Blood Test

Worried about anemia? Testing these two vitamins levels can help.

Vitamins B12 and folate support many different cellular functions throughout the body. B12 supports nerve function, and folate plays a part in converting carbohydrates into energy as well as producing DNA; both B complex vitamins are also essential for making red blood cells.
Folate is particularly important during pregnancy and plays a role in fetal development. A folate deficiency during pregnancy can increase the risk of neurologic defects to the growing fetus.1
Most individuals get enough folate from foods, especially in the U.S., where all grains and cereal products are fortified with folic acid. However, some people don’t consume enough vitamin B12 to meet their needs, while others can’t absorb enough, no matter how much they take in.2
This test measures both your B12 and folate levels to detect any deficiencies and to diagnose the cause of anemia, if present.



If you’re taking a supplement containing biotin (also called vitamin B7 or B8, vitamin H, or coenzyme R), commonly found in products promoting nail, skin, and hair health, it is recommended that you wait at least 72 hours from your last dose before sample collection.