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 Amphetamines (3) Antiarrhythmics (9) Antiparasitics (3) Benzodiazepines (4) Beta Blockers (3) Insecticides (2) Metals/Elements (6) Other (32) (-) Parkinsons (1) Toxic Elements (8) Test Test Name 2504SP Levodopa, Serum/Plasma