Test guide
Vitamin B Test
A vitamin B test measures the amount of one or more B vitamins in your blood or urine (pee). B vitamins are nutrients that your body needs to work well and stay healthy. There are eight different types. All together, they are called the “B vitamin complex.”
What it is for
Vitamin B testing is used if you have symptoms that suggest you may not be getting enough of one or more B vitamins. For example, a vitamin B12 and folate test is often used for symptoms of certain types of anemia . A lack of B vitamins is called a vitamin B deficiency. Vitamin B deficiencies are not as common in the United States, because many everyday foods are fortified with B vitamins. These foods include cereals, breads, and pasta. However, even if you don’t eat any of these fortified foods, you can still get plenty of vitamin B from leafy green vegetables, meats, eggs, milk and other dairy products, and whole grains. Source: MedlinePlus, National Library of Medicine. Medical test information is public domain. Source identity and definition checked automatically on 2026-10-18. No individual clinical interpretation or human reviewer is asserted.
Limitations
Reference intervals and interpretation depend on the laboratory, specimen, method and clinical context. This source definition is educational information; it does not establish a diagnosis, product approval or suitability for an individual.
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