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) (2) Sample Type (-) Blood (1) Fluid (1) Serum or Plasma (4) Tissue (1) (-) Urine (1) Test Area Therapeutics (2) Test Category Antidepressants (5) (-) Antiepileptics/Antiseizures (2) Antihypertensives (2) Antimicrobials (1) Immunosuppressants (1) Metals/Elements (3) Vasodilators (1) Volatiles (2) Test Sub-Category Other (2) Test Test Name 4757B Valproic Acid, Blood 4757U Valproic Acid, Urine