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 (4) Fluid (1) Serum or Plasma (4) Tissue (1) (-) Urine (2) Test Area Therapeutics (2) Test Category (-) Antihypertensives (2) Test Sub-Category Alpha-2 Adrenergic Agonists (2) Alpha-2 Adrenergic Antagonists (1) Beta Blockers (4) (-) Calcium Channel Blockers (2) Diuretics (2) Test Test Name 1640U Diltiazem, Urine 4770U Verapamil, Urine