Vitamin B3 (Niacin) Test

A vitamin B3 (niacin) test measures the levels of niacin in the blood to determine if there is a deficiency or excess of this important vitamin. Vitamin B3 is necessary for the proper functioning of the nervous system, digestion, and skin health.

The test may be ordered if a healthcare provider suspects a niacin deficiency or excess based on symptoms such as skin rash, diarrhea, memory loss, or fatigue. It may also be ordered if a person is at risk of niacin deficiency due to certain health conditions, lifestyle factors, or use of certain medications.

To perform the test, a blood sample is taken and sent to a laboratory for analysis. The results will indicate whether the levels of niacin in the blood are within the normal range or if there is a deficiency or excess.