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) (1) (-) Enzyme-Linked Immunosorbent Assay (ELISA) (2) Gas Chromatography (GC) (12) Gas Chromatography/Mass Spectrometry (GC/MS) (4) Headspace Gas Chromatography (GC) (1) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (47) High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS) (3) Sample Type (-) Blood (2) Fluid (1) Serum or Plasma (1) Tissue (1) Test Area Drugs of Abuse (1) (-) Therapeutics (2) Test Category Analgesics (2) Test Sub-Category Opiates/Opioids (2) Test Test Name 3236B Opiates Screen, Blood 3241B Opiates - Free (Unconjugated), Blood