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 (3) Serum or Plasma (3) (-) Urine (1) Test Area (-) Therapeutics (1) Test Category Analgesics (5) Anesthetics (2) Antacids (1) Anticholinergics (1) Antidepressants (5) Antiepileptics/Antiseizures (3) Antihypertensives (3) Antimicrobials (2) Antimigraines (1) Antiparkinsons (1) Antipsychotics (5) Bronchodilators (1) Cholinesterase Inhibitors (1) Decongestants (1) Sedative/Hypnotics (5) Stimulants (2) Sympathomimetic Amines (1) (-) Vasodilators (1) Test Sub-Category Other (1) Test Test Name 4197U Sildenafil and Metabolite, Urine