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 (-) Serum or Plasma (1) Urine (3) Test Area Exposure (1) Test Category Analgesics (4) Antianxiety (1) Antidepressants (2) Antidiabetics (1) Antihypertensives (2) Industrial/Environmental Toxins (1) Metals/Elements (1) NPS/Designer Drugs (3) Opiate/Opioid Antagonists (2) Other (1) Sedative/Hypnotics (2) Stimulants (2) (-) Therapeutics (1) Vasodilators (1) Test Sub-Category Other (1) Test Test Name 3174SP Nitrate/Nitrite (Qualitative), Serum/Plasma