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) Sample Type (-) Blood (1) Serum or Plasma (1) Urine (4) Test Area Drugs of Abuse (4) (-) Exposure (1) Postmortem (1) Therapeutics (9) Test Category Industrial/Environmental Toxins (1) Vasodilators (1) Test Sub-Category (-) Other (1) Toxic Elements (1) Test Test Name 3174B Nitrate/Nitrite (Qualitative), Blood (Forensic)