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 (4) Alcohols (9) Analgesics (12) Anesthetics (4) Antianxiety (4) Antiarrhythmics (2) Anticholinergics (2) Antidepressants (8) Antidiabetics (3) (-) Antidiarrheals (1) Antiemetics (1) Antiepileptics/Antiseizures (15) Antihistamines (6) Antihypertensives (7) Antimicrobials (10) Antineoplastics (1) Antipsychotics (6) Antithyroids (1) Antitussives/Cough Suppressants (4) Biomarkers (3) Cholinesterase Inhibitors (1) Depressants (3) Emetics (2) Expectorants (2) Gases (1) Hallucinogens (12) Herbicides (2) Hydrocarbons (1) Immunosuppressants (3) Laxatives (1) Metals/Elements (32) Mood Stabilizers (2) Muscle Relaxants (5) NMDA Antagonists (1) NPS/Designer Drugs (2) Pesticides/Insecticides (4) Sedative/Hypnotics (12) Solvents (10) Stimulants (4) Volatiles (22) Test Sub-Category Other (1) Test Test Name 2533B Loperamide and Metabolite, Blood