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) Drugs of Abuse (1) Test Sub-Category Alpha-2 Adrenergic Agonists (2) Alpha-2 Adrenergic Antagonists (1) Alpha Blockers (3) Beta Blockers (8) Calcium Channel Blockers (4) Diuretics (6) (-) Vasodilators (1) Test Test Name 2308SP Hydralazine, Serum/Plasma