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) Sample Type (-) Serum or Plasma (1) Test Area (-) Therapeutics (1) Test Category Dopamine Precursor (1) Test Sub-Category Anticholinergics (1) Dopamine Antagonists (1) Other (2) (-) Parkinsons (1) Test Test Name 2504SP Levodopa, Serum/Plasma