Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Colorimetry (C) (4) Enzyme-Linked Immunosorbent Assay (ELISA) (24) Enzyme Immunoassay (EIA) (6) (-) Gas Chromatography (GC) (3) Gas Chromatography/Mass Spectrometry (GC/MS) (12) Headspace Gas Chromatography (GC) (18) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (45) 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 (3) Test Category Antihypertensives (3) Test Sub-Category Calcium Channel Blockers (3) Test Test Name 4770B Verapamil, Blood 4770FL Verapamil, Fluid 4770U Verapamil, Urine