Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (1) Sample Type Blood (5) Serum or Plasma (7) (-) Urine (1) Test Area Drugs of Abuse (4) Postmortem (3) (-) Therapeutics (1) Test Category Vasodilators (1) Test Sub-Category Alpha-2 Adrenergic Agonists (2) Alpha-2 Adrenergic Antagonists (1) Beta Blockers (5) Calcium Channel Blockers (2) Diuretics (2) (-) Other (1) Test Test Name 4197U Sildenafil and Metabolite, Urine