Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Chemistry Analyzer (1) Enzymatic Assay (EZA) (1) Gas Chromatography (GC) (1) Headspace Gas Chromatography (GC) (4) (-) High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS) (1) Spectrophotometry (SP) (1) Sample Type Serum or Plasma (1) Test Area Therapeutics (1) Test Category Antiarrhythmics (3) Antipsychotics (3) Antithyroids (2) (-) Dopamine Precursor (1) Test Sub-Category Parkinsons (1) Test Test Name 2504SP Levodopa, Serum/Plasma