Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Colorimetry (C) (9) Enzyme Immunoassay (EIA) (3) Gas Chromatography (GC) (8) (-) Gas Chromatography (GC) and Gas Chromatography/Mass Spectrometry (GC/MS) (1) Gas Chromatography/Mass Spectrometry (GC/MS) (7) Headspace Gas Chromatography (GC) (5) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (26) High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS) (1) High Performance Liquid Chromatography/Time of Flight-Mass Spectrometry (LC/TOF-MS) (1) Inductively Coupled Plasma/Mass Spectrometry (ICP/MS) (15) Inductively Coupled Plasma/Optical Emission Spectrometry (ICP/OES) (1) Refractometer (REF) (2) Sample Type Blood (1) Serum or Plasma (1) (-) Urine (1) Test Area Therapeutics (1) Test Category Analgesics (1) Test Sub-Category Opiates/Opioids (1) Test Test Name 8721U Meperidine and Metabolite, Urine