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) (2) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (32) Sample Type Blood (1) Fluid (1) (-) Serum or Plasma (2) Tissue (1) Urine (1) Test Area Drugs of Abuse (1) Impairment (1) Postmortem (1) (-) Therapeutics (2) Test Category Antihypertensives (2) Test Sub-Category Calcium Channel Blockers (1) Vasodilators (1) Test Test Name 2308SP Hydralazine, Serum/Plasma 4770SP Verapamil, Serum/Plasma