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 (1) Analgesics (7) Antianxiety (2) Anticholinergics (1) Antidepressants (2) Antidiabetics (2) (-) Antidiarrheals (1) Antiemetics (1) Antiepileptics/Antiseizures (7) Antihistamines (4) Antihypertensives (4) Antimicrobials (7) Antineoplastics (1) Antipsychotics (4) Antitussives/Cough Suppressants (2) Cholinesterase Inhibitors (1) Depressants (1) Emetics (1) Expectorants (1) Gases (1) Hallucinogens (4) Immunosuppressants (3) Muscle Relaxants (3) NMDA Antagonists (1) NPS/Designer Drugs (1) Sedative/Hypnotics (6) Solvents (1) Stimulants (2) Volatiles (5) Test Sub-Category Other (1) Test Test Name 2533B Loperamide and Metabolite, Blood