Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) (-) Enzyme Immunoassay (EIA) (2) Gas Chromatography (GC) (4) Gas Chromatography (GC) and Gas Chromatography/Mass Spectrometry (GC/MS) (1) Gas Chromatography/Mass Spectrometry (GC/MS) (2) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (14) High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS) (1) Sample Type Blood (1) Serum or Plasma (1) (-) Urine (2) Test Area Drugs of Abuse (1) (-) Therapeutics (2) Test Category Analgesics (2) Test Sub-Category Opiates/Opioids (2) Test Test Name 9324U Methadone Screen, Urine 9444U Meperidine Screen, Urine