Vitamin B Test Test
A vitamin B test measures the level of one or more B vitamins in your blood or urine to check if you have a deficiency.
What this test measures
The test checks the level of one or more of the eight B vitamins: B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxal phosphate), B7 (biotin), B9 (folate), and B12 (cobalamin). These vitamins help your body make energy, produce healthy blood cells, and keep your nervous system working properly.
What your results mean
Reference ranges vary by laboratory and by your age and sex. MedlinePlus does not publish a single normal range for this test — always read your result against the range printed on your own lab report and discuss it with your provider.
Lower-than-normal results
If you are lacking in one or more B vitamins, you may need other tests to find out why. Your provider may recommend supplements or IV treatment.
Frequently asked questions
What does a vitamin B test measure?
It measures the level of one or more B vitamins in your blood or urine.
Why are B vitamins important?
They help maintain normal metabolism, make healthy blood cells, and keep your nervous system working properly.
How do I get B vitamins?
You get them from foods like leafy green vegetables, meats, fish, eggs, whole grains, milk, and dairy products. Many foods in the U.S. have added B vitamins.
What happens if I lack B vitamins?
A lack can cause serious health problems, such as anemia and nerve disorders.
Should I take vitamin B supplements?
Talk with your health care provider first, because large amounts of some B vitamins can cause health problems and may affect how certain medicines work.
Related lab tests
Sources
- MedlinePlus: Vitamin B Test — NIH MedlinePlus
Last updated . Information is aggregated from official public sources and is not a substitute for professional medical care.