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) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (13) Sample Type Urine (1) Test Area (-) Therapeutics (1) Test Category Analgesics (1) Test Sub-Category Anticholinergics (3) Barbiturates (5) (-) Opiates/Opioids (1) Other (11) Phenothiazines (5) Tricyclic (3) Test Test Name 4303U Talwin® Nx, Urine