Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Gas Chromatography (GC) (1) Sample Type Blood (2) Serum or Plasma (4) (-) Urine (1) Test Area Drugs of Abuse (1) Postmortem (1) (-) Therapeutics (1) Test Category Antiparkinsons (1) Test Sub-Category Anticholinergics (1) Test Test Name 4680U Trihexyphenidyl, Urine