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 Alcohols (4) Anesthetics (2) Antianxiety (1) Antiarrhythmics (1) Anticholinergics (1) Antidiabetics (1) (-) Antidiarrheals (1) Antiepileptics/Antiseizures (8) Antihistamines (3) Antineoplastics (1) Antipsychotics (5) Antithyroids (1) Antitussives/Cough Suppressants (2) Biomarkers (2) Cholinesterase Inhibitors (1) Emetics (1) Expectorants (1) Hallucinogens (6) Herbicides (1) Immunosuppressants (3) Metals/Elements (6) Muscle Relaxants (3) NMDA Antagonists (1) Pesticides/Insecticides (1) Sedative/Hypnotics (4) Solvents (4) Stimulants (1) Volatiles (15) Test Sub-Category Antihistamines (1) (-) Other (1) Test Test Name 2533B Loperamide and Metabolite, Blood