Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Colorimetry (C) (1) (-) High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS) (1) Inductively Coupled Plasma/Mass Spectrometry (ICP/MS) (13) Inductively Coupled Plasma/Optical Emission Spectrometry (ICP/OES) (1) Ion Specific Electrode (ISE) (3) Sample Type Serum or Plasma (1) Test Area Therapeutics (1) Test Category Dopamine Precursor (1) Test Sub-Category Other (8) (-) Parkinsons (1) Test Test Name 2504SP Levodopa, Serum/Plasma