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) Test Area Exposure (1) Therapeutics (1) Test Category Anesthetics (1) Antidepressants (1) Antidiabetics (1) (-) Industrial/Environmental Toxins (1) NPS/Designer Drugs (3) Opiate/Opioid Antagonists (2) Stimulants (2) Vasodilators (1) Test Sub-Category (-) Other (1) Test Test Name 3174B Nitrate/Nitrite (Qualitative), Blood (Forensic)