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) High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS) (1) Sample Type Blood (1) (-) Serum or Plasma (2) Urine (1) Test Area Therapeutics (2) Test Category Antiparkinsons (1) Dopamine Precursor (1) Test Sub-Category (-) Anticholinergics (1) Dopamine Antagonists (1) Other (3) (-) Parkinsons (1) Test Test Name 2504SP Levodopa, Serum/Plasma 4680SP Trihexyphenidyl, Serum/Plasma