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 Antiarrhythmics (5) Barbiturates (3) Insecticides (3) Opiates/Opioids (4) Organochlorides (1) Other (58) (-) Parkinsons (1) Phenothiazines (1) Tetracyclics (3) Tricyclic (3) Vasodilators (1) Test Test Name 2504SP Levodopa, Serum/Plasma