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 (6) Antianxiety (3) Antidiarrheals (1) Antiepileptics/Antiseizures (6) Antihistamines (3) Antihypertensives (2) Antimicrobials (2) Antipsychotics (3) (-) Dopamine Precursor (1) Hallucinogens (4) Immunosuppressants (2) Laxatives (1) Metals/Elements (5) Mood Stabilizers (3) Pesticides/Insecticides (1) Stimulants (2) Test Sub-Category Parkinsons (1) Test Test Name 2504SP Levodopa, Serum/Plasma