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