Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Gas Chromatography (GC) (1) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (1) Sample Type Blood (2) Fluid (2) Serum or Plasma (5) Tissue (2) (-) Urine (2) Test Area Therapeutics (2) Test Category Antidepressants (2) (-) Antiepileptics/Antiseizures (1) (-) Antihypertensives (1) Metals/Elements (1) Volatiles (1) Test Sub-Category Calcium Channel Blockers (1) Other (1) Test Test Name 4757U Valproic Acid, Urine 4770U Verapamil, Urine