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) Sample Type Serum or Plasma (1) Test Area (-) Therapeutics (1) Test Category (-) Antihypertensives (1) Test Sub-Category Alpha-2 Adrenergic Agonists (6) Alpha-2 Adrenergic Antagonists (3) Alpha Blockers (6) Beta Blockers (25) Calcium Channel Blockers (12) Diuretics (13) (-) Vasodilators (1) Test Test Name 2308SP Hydralazine, Serum/Plasma