Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Enzyme-Linked Immunosorbent Assay (ELISA) (7) Enzyme Immunoassay (EIA) (2) (-) Gas Chromatography (GC) (1) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (38) Sample Type Serum or Plasma (1) Test Area Exposure (8) (-) Therapeutics (1) Test Category Antihypertensives (1) Test Sub-Category Vasodilators (1) Test Test Name 2308SP Hydralazine, Serum/Plasma