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 Carboxylic Acids (3) Hydrocarbons (1) Other (29) (-) Parkinsons (1) Selective Serotonin Reuptake Inhibitors (SSRI) (5) Test Test Name 2504SP Levodopa, Serum/Plasma