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) (2) 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) Alpha Blockers (3) Beta Blockers (9) Calcium Channel Blockers (3) Diuretics (6) Other (7) Thiazides (1) Test Test Name 1275SP Clonidine, Serum/Plasma 2186SP Guanfacine, Serum/Plasma