The Vitamin B3 (Niacin) Quantitative Serum test measures the levels of niacin and its active metabolites in your blood to evaluate your nutritional status, detect a deficiency, or monitor therapeutic use. [1] (https://www.nidanpathologylaboratory.com/wakad/latest-update/vitamin-b3-niacin-quantitative-serum/629)Chikhali Chinchwad
