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) Enzyme-Linked Immunosorbent Assay (ELISA) (1) Gas Chromatography/Mass Spectrometry (GC/MS) (2) Headspace Gas Chromatography (GC) (1) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (8) High Performance Liquid Chromatography/Time of Flight-Mass Spectrometry (LC/TOF-MS) (2) Sample Type (-) Blood (1) Serum or Plasma (1) Urine (2) Test Area Exposure (1) Therapeutics (1) Test Category Industrial/Environmental Toxins (1) Vasodilators (1) Test Sub-Category (-) Other (1) Tricyclic (1) Test Test Name 3174B Nitrate/Nitrite (Qualitative), Blood (Forensic)