Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Colorimetry (C) (1) Gas Chromatography (GC) (2) (-) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (1) Sample Type Blood (2) Fluid (1) Serum or Plasma (2) Tissue (1) (-) Urine (1) Test Area Exposure (1) Test Category Industrial/Environmental Toxins (1) Test Sub-Category Antispasmodics (1) Benzodiazepines (1) Opiates/Opioids (5) (-) Other (1) Test Test Name 1355U o-Toluidine, Urine