Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Enzyme-Linked Immunosorbent Assay (ELISA) (15) (-) Gas Chromatography (GC) (1) Gas Chromatography/Mass Spectrometry (GC/MS) (4) Headspace Gas Chromatography (GC) (12) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (29) High Performance Liquid Chromatography/Time of Flight-Mass Spectrometry (LC/TOF-MS) (13) Sample Type (-) Blood (1) Fluid (1) Serum or Plasma (2) Tissue (1) Urine (1) Test Area Therapeutics (1) Test Category Antihypertensives (1) Test Sub-Category Calcium Channel Blockers (1) Test Test Name 4770B Verapamil, Blood