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This Vitamin B3 Test, sometimes referred to as a niacin test, is used to measure the amount of vitamin b3 (niacin) in the blood. Vitamin B3 (or niacin) is fundamental in converting carbohydrates to glucose and metabolizing fats and proteins. Meat, fish, and carbohydrates are excellent sources of vitamin B3. Those with a slight vitamin B3 deficiency are prone to fatigue, canker sores, vomiting, and/or changes in mood while more serious symptoms can include rash, tongue swelling, and even disorientation or memory loss. But, Priority Lab Testing’s Vitamin B3 Test can determine such a deficiency for certain.