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 Anticoagulants (2) Antiplatelet Agents (2) Cannabinoids (4) Cyanide (3) Dopamine Antagonists (3) Other (25) (-) Parkinsons (1) Proton-Pump Inhibitors (2) Tetracyclics (1) Tricyclic (2) Test Test Name 2504SP Levodopa, Serum/Plasma