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 Acids (3) Alcohols (3) Antianxiety (3) Antiarrhythmics (3) Antidepressants (5) Antipsychotics (3) Antithyroids (2) (-) Dopamine Precursor (1) Gases (1) Sedative/Hypnotics (5) Solvents (2) Volatiles (8) Test Sub-Category Parkinsons (1) Test Test Name 2504SP Levodopa, Serum/Plasma