Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Enzyme Immunoassay (EIA) (1) Gas Chromatography/Mass Spectrometry (GC/MS) (1) Headspace Gas Chromatography (GC) (1) (-) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (2) High Performance Liquid Chromatography/Time of Flight-Mass Spectrometry (LC/TOF-MS) (1) Sample Type Blood (2) Serum or Plasma (2) (-) 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 (5) Calcium Channel Blockers (1) Diuretics (2) Other (2) Test Test Name 1275U Clonidine, Urine 2186U Guanfacine, Urine