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 Anesthetics (3) Antianxiety (1) Antidiarrheals (1) Antiepileptics/Antiseizures (3) Antihistamines (2) Antihypertensives (1) Antimicrobials (1) Antipsychotics (2) (-) Dopamine Precursor (1) Hallucinogens (2) Immunosuppressants (2) Metals/Elements (2) Mood Stabilizers (1) Pesticides/Insecticides (1) Stimulants (1) Test Sub-Category Parkinsons (1) Test Test Name 2504SP Levodopa, Serum/Plasma