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 Blood (1) (-) Serum or Plasma (1) Test Area Therapeutics (1) Test Category Acids (1) Alcohols (4) Analgesics (11) Anesthetics (4) Antianxiety (2) Antiarrhythmics (1) Anticholinergics (1) Antidepressants (5) Antidiabetics (4) (-) Antidiarrheals (1) Antiemetics (1) Antiepileptics/Antiseizures (11) Antihistamines (4) Antihypertensives (6) Antimicrobials (12) Antipsychotics (7) Antithyroids (1) Antitussives/Cough Suppressants (3) Biomarkers (1) Carbonic Anhydrase Inhibitors (1) Cholinesterase Inhibitors (1) Depressants (2) Diuretics (1) Dopamine Precursor (1) Emetics (1) Expectorants (1) Hallucinogens (6) Herbicides (1) Immunosuppressants (2) Metals/Elements (19) Mood Stabilizers (2) Muscle Relaxants (3) NMDA Antagonists (1) NPS/Designer Drugs (1) Pesticides/Insecticides (3) Retinoids (2) Sedative/Hypnotics (8) Solvents (7) Stimulants (2) Volatiles (8) Test Sub-Category Other (1) Test Test Name 2533SP Loperamide and Metabolite, Serum/Plasma