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) (2) Sample Type (-) Blood (2) Serum or Plasma (4) Urine (1) Test Area Drugs of Abuse (1) Postmortem (2) (-) Therapeutics (2) Test Category Antiparkinsons (2) Test Sub-Category Anticholinergics (1) Dopamine Antagonists (1) Test Test Name 4115B Ropinirole, Blood 4680B Trihexyphenidyl, Blood