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 (2) Alpha-2 Adrenergic Antagonists (1) Alpha Blockers (3) Beta Blockers (12) Calcium Channel Blockers (5) Diuretics (6) Other (7) Thiazides (1) (-) Vasodilators (1) Test Test Name 2308SP Hydralazine, Serum/Plasma