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 (9) Anesthetics (4) Antianxiety (2) Antiarrhythmics (1) Anticholinergics (1) Antidepressants (5) Antidiabetics (2) (-) Antidiarrheals (1) Antiemetics (1) Antiepileptics/Antiseizures (10) Antihistamines (5) Antihypertensives (4) Antimicrobials (8) Antineoplastics (1) Antipsychotics (6) Antithyroids (1) Antitussives/Cough Suppressants (3) Biomarkers (2) Cholinesterase Inhibitors (1) Depressants (1) Emetics (1) Expectorants (1) Gases (1) Hallucinogens (6) Herbicides (1) Immunosuppressants (3) Metals/Elements (18) Mood Stabilizers (2) Muscle Relaxants (3) NMDA Antagonists (1) NPS/Designer Drugs (1) Pesticides/Insecticides (3) Sedative/Hypnotics (9) Solvents (8) Stimulants (2) Volatiles (20) Test Sub-Category Other (1) Test Test Name 2533B Loperamide and Metabolite, Blood