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) (1) (-) Gas Chromatography (GC) (1) Gas Chromatography/Mass Spectrometry (GC/MS) (1) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (3) Sample Type (-) Urine (1) Test Area Therapeutics (1) Test Category Acids (1) (-) Analgesics (1) Antidepressants (2) Antiepileptics/Antiseizures (1) Antipsychotics (3) Solvents (1) Volatiles (1) Test Sub-Category Opiates/Opioids (1) Test Test Name 4303U Talwin® Nx, Urine