Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (1) Sample Type Serum or Plasma (1) Test Area Therapeutics (1) Test Category Antidepressants (1) Antiepileptics/Antiseizures (8) Antimicrobials (3) Immunosuppressants (1) (-) Other (1) Vasodilators (2) Volatiles (2) Test Sub-Category (-) Other (1) Test Test Name 4780SP Vitamin B3 (Niacin and Metabolites), Serum/Plasma