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 Anesthetics (4) Antianxiety (2) (-) Antidiarrheals (1) Antiepileptics/Antiseizures (4) Antihistamines (2) Antihypertensives (2) Antimicrobials (1) Antipsychotics (2) Hallucinogens (2) Immunosuppressants (2) Metals/Elements (5) Mood Stabilizers (3) Pesticides/Insecticides (1) Stimulants (1) Test Sub-Category Other (1) Test Test Name 2533B Loperamide and Metabolite, Blood