Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Enzyme-Linked Immunosorbent Assay (ELISA) (10) Headspace Gas Chromatography (GC) (8) (-) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (1) High Performance Liquid Chromatography/Time of Flight-Mass Spectrometry (LC/TOF-MS) (10) Sample Type (-) Blood (1) Serum or Plasma (1) Test Area Therapeutics (1) Test Category Antidiarrheals (1) Test Sub-Category Other (1) Test Test Name 2533B Loperamide and Metabolite, Blood