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 (2) Serum or Plasma (2) (-) Urine (1) Test Area Therapeutics (1) Test Category Antiarrhythmics (1) Antihypertensives (11) Diuretics (1) Drugs of Abuse (3) Drugs of Abuse, Therapeutics (1) Therapeutics (3) (-) Vasodilators (1) Test Sub-Category Other (1) Test Test Name 4197U Sildenafil and Metabolite, Urine