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) (20) Enzyme Immunoassay (EIA) (6) (-) Gas Chromatography (GC) (2) Gas Chromatography/Mass Spectrometry (GC/MS) (8) Headspace Gas Chromatography (GC) (16) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (42) High Performance Liquid Chromatography/Time of Flight-Mass Spectrometry (LC/TOF-MS) (18) Sample Type (-) Blood (1) Fluid (1) Serum or Plasma (2) Tissue (1) (-) Urine (1) Test Area Therapeutics (2) Test Category Antihypertensives (2) Test Sub-Category Calcium Channel Blockers (2) Test Test Name 4770B Verapamil, Blood 4770U Verapamil, Urine