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) Tissue (1) Test Area (-) Therapeutics (1) Test Category Analgesics (10) Anesthetics (3) Antianxiety (2) Antiarrhythmics (1) Anticholinergics (1) Antidepressants (4) Antidiabetics (4) Antidiarrheals (1) Antiemetics (1) Antiepileptics/Antiseizures (11) Antihistamines (3) Antihypertensives (6) Antimicrobials (11) Antipsychotics (6) Antithyroids (1) Antitussives/Cough Suppressants (2) Carbonic Anhydrase Inhibitors (1) Cholinesterase Inhibitors (1) Depressants (1) Diuretics (1) (-) Dopamine Precursor (1) Expectorants (1) Immunosuppressants (2) Mood Stabilizers (1) Muscle Relaxants (3) NMDA Antagonists (1) Retinoids (2) Sedative/Hypnotics (6) Stimulants (1) Test Sub-Category Parkinsons (1) Test Test Name 2504SP Levodopa, Serum/Plasma