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 Antiparkinsons (1) Test Sub-Category Alkaloids (1) Antibiotics (1) (-) Anticholinergics (1) Benzodiazepines (1) Cyanide (1) Opiates/Opioids (5) Other (12) Phenothiazines (1) Toxic Elements (5) Tricyclic (3) Vasoconstrictors (1) Test Test Name 4680U Trihexyphenidyl, Urine