Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) (-) Gas Chromatography (GC) (1) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (4) Sample Type Blood (1) Serum or Plasma (1) (-) Urine (1) Test Area Therapeutics (1) Test Category Analgesics (1) Test Sub-Category Anticholinergics (1) Calcium Channel Blockers (1) (-) Opiates/Opioids (1) Other (9) Phenothiazines (1) Tricyclic (1) Test Test Name 4303U Talwin® Nx, Urine