Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Gas Chromatography (GC) (2) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (13) (-) High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS) (2) Immunoassay (IA) (1) Inductively Coupled Plasma/Mass Spectrometry (ICP/MS) (1) Sample Type Blood (1) (-) Serum or Plasma (2) Urine (1) Test Area (-) Therapeutics (2) Test Category Antipsychotics (1) Dopamine Precursor (1) Test Sub-Category Other (1) Parkinsons (1) Test Test Name 2504SP Levodopa, Serum/Plasma 2538SP Loxapine, Serum/Plasma