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 (1) (-) Serum or Plasma (1) Urine (1) Test Area Exposure (1) (-) Therapeutics (1) Test Category Analgesics (4) Anesthetics (3) Antidepressants (4) Antidiabetics (2) Antiepileptics/Antiseizures (3) Antihistamines (1) Antihypertensives (3) Antimicrobials (1) Antineoplastics (1) (-) Antiparkinsons (1) Antipsychotics (6) Antirheumatics (1) Bronchodilators (2) Cholinesterase Inhibitors (1) Diuretics (1) Immunosuppressants (2) Muscle Relaxants (1) Sedative/Hypnotics (2) Stimulants (1) Sympathomimetic Amines (1) Vasodilators (1) Test Sub-Category Anticholinergics (1) Test Test Name 4680SP Trihexyphenidyl, Serum/Plasma