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 (2) Serum or Plasma (2) Urine (1) Test Area Therapeutics (2) Test Category (-) Antihypertensives (2) Test Sub-Category Alpha-2 Adrenergic Agonists (1) (-) Alpha Blockers (1) (-) Calcium Channel Blockers (1) Diuretics (1) Test Test Name 1640B Diltiazem, Blood 1815B Doxazosin, Blood