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) Inductively Coupled Plasma/Mass Spectrometry (ICP/MS) (6) Sample Type Blood (1) (-) Serum or Plasma (1) Urine (1) Test Area Therapeutics (1) Test Category Antiparkinsons (1) Test Sub-Category (-) Anticholinergics (1) Barbiturates (2) Other (7) Phenothiazines (2) Sedative-Hypnotics (1) Tricyclic (1) Test Test Name 4680SP Trihexyphenidyl, Serum/Plasma