Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (2) Sample Type Blood (1) (-) Serum or Plasma (1) (-) Urine (1) Test Area Therapeutics (2) Test Category (-) Antihypertensives (2) Test Sub-Category Alpha-2 Adrenergic Agonists (2) Alpha Blockers (1) (-) Calcium Channel Blockers (2) Diuretics (1) Test Test Name 1640SP Diltiazem, Serum/Plasma 1640U Diltiazem, Urine