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) (2) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (2) High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS) (1) Sample Type (-) Blood (1) (-) Serum or Plasma (1) Urine (1) Test Area Therapeutics (2) Test Category Acids (2) Alcohols (2) Anesthetics (4) Antidepressants (6) Antiepileptics/Antiseizures (2) Antihistamines (2) Antihypertensives (2) Antimicrobials (2) (-) Antiparkinsons (2) Antipsychotics (4) Cholinesterase Inhibitors (2) Depressants (2) Other (1) Sedative/Hypnotics (1) Solvents (2) Terpenes (2) Volatiles (4) Test Sub-Category Anticholinergics (2) Test Test Name 4680B Trihexyphenidyl, Blood 4680SP Trihexyphenidyl, Serum/Plasma