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 (2) (-) Urine (1) Test Area (-) Therapeutics (1) Test Category Antiparkinsons (1) Test Sub-Category Alkaloids (1) Antibiotics (1) (-) Anticholinergics (1) Benzodiazepines (1) Opiates/Opioids (4) Other (6) Phenothiazines (1) Tricyclic (3) Vasoconstrictors (1) Test Test Name 4680U Trihexyphenidyl, Urine