B Vitamins

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Also known as: Vitamin B complex
Formal name: B1 (thiamine or thiamin); B2 (riboflavin); B3 (niacin); B5 (pantothenic acid); B6 (pyridoxal phosphate, pyridoxine); B7 (biotin); Vitamins B9 (folate, folic acid) and B12 are also part of the group but are more commonly measured individually and are discussed separately.
Related tests: Vitamin B12 and Folate

At a Glance

Why Get Tested?

To screen for and detect moderate to severe vitamin B deficiencies

When to Get Tested?

When someone has symptoms that may be due to a B vitamin deficiency, is at risk for a deficiency, or has a condition associated with malabsorption. However, most people at risk are treated with vitamin B complex and do not require testing.

Sample Required?

A blood sample taken from a vein in your arm.

Test Preparation Needed?

The blood sample is usually collected in the morning after an overnight fast, and preferably before taking any medication.