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 Acids (3) Alcohols (6) Analgesics (3) Anesthetics (8) Antianxiety (3) Antiarrhythmics (3) Antidepressants (11) Antiepileptics/Antiseizures (8) Antihypertensives (1) Antipsychotics (4) Antithyroids (2) Biomarkers (1) Depressants (1) (-) Dopamine Precursor (1) Gases (1) Hallucinogens (6) Herbicides (3) Pesticides/Insecticides (4) Sedative/Hypnotics (7) Solvents (15) Volatiles (16) Test Sub-Category Parkinsons (1) Test Test Name 2504SP Levodopa, Serum/Plasma