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) (5) (-) Gas Chromatography (GC) and Gas Chromatography/Mass Spectrometry (GC/MS) (2) Gas Chromatography/Mass Spectrometry (GC/MS) (1) Headspace Gas Chromatography (GC) (5) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (14) High Performance Liquid Chromatography/Time of Flight-Mass Spectrometry (LC/TOF-MS) (2) Sample Type (-) Blood (2) Serum or Plasma (1) Urine (1) Test Area Therapeutics (2) Test Category Analgesics (2) Test Sub-Category Barbiturates (1) (-) Opiates/Opioids (2) Other (2) Phenothiazines (2) Tricyclic (6) Test Test Name 8721B Meperidine and Metabolite, Blood 8723B Pentazocine, Blood