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) Test Area Exposure (1) Test Category Analgesics (7) Anesthetics (1) Antianxiety (2) Antidepressants (6) Antidiabetics (2) Antihypertensives (4) Industrial/Environmental Toxins (2) Metals/Elements (2) NPS/Designer Drugs (8) Opiate/Opioid Antagonists (4) Other (1) Sedative/Hypnotics (4) Stimulants (4) (-) Therapeutics (1) Vasodilators (2) Test Sub-Category Other (1) Test Test Name 3174SP Nitrate/Nitrite (Qualitative), Serum/Plasma