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 (1) Urine (1) Test Area Therapeutics (1) Test Category Analgesics (3) Antiarrhythmics (1) Anticholinergics (2) Antidepressants (1) Antiepileptics/Antiseizures (1) Antimicrobials (1) Antimigraines (1) Antiparkinsons (1) Biomarkers (1) Metals/Elements (4) NPS/Designer Drugs (2) Opiates/Opioids (1) Pesticides/Insecticides (1) Sedative/Hypnotics (2) (-) Vasodilators (1) Volatiles (1) Test Sub-Category Other (1) Test Test Name 4197SP Sildenafil and Metabolite, Serum/Plasma