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 (1) (-) Serum or Plasma (1) Urine (1) Test Area Therapeutics (2) Test Category Antiparkinsons (2) Test Sub-Category Alkaloids (2) Alpha Blockers (2) Antibiotics (2) (-) Anticholinergics (2) Benzodiazepines (4) Beta-2 Andrenergic Agonists (1) Beta Blockers (2) Diuretics (2) NSAIDs (2) Opiates/Opioids (6) Other (29) Sulfonylureas (2) Tricyclic (2) Vasoconstrictors (2) Test Test Name 4680B Trihexyphenidyl, Blood 4680SP Trihexyphenidyl, Serum/Plasma