Nitrite
- Sample Type
- Standard
- Fasting
- No
- Unit
- n/a
The Nitrite test is a biochemical marker used during a Complete Urine Examination to screen for asymptomatic bacteriuria or symptomatic Urinary Tract Infections (UTIs). Most common uropathogens (specifically Gram-negative Enterobacteriaceae like E. coli) produce the enzyme nitrate reductase, which converts dietary nitrates into nitrites. A positive result is highly specific for the presence of bacteria in the urinary tract.
Why Context Matters
False negatives are common if the urine has not remained in the bladder long enough (minimum 4 hours) for conversion to occur, if the patient has a low-nitrate diet, or if the infection is caused by organisms that do not produce nitrate reductase (e.g., Enterococci, S. saprophyticus, or Pseudomonas).
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Clinical References
Source-of-truth databases and clinical guidelines for Nitrite:
Official Sources
- Nitrites in Urine: MedlinePlus Medical TestMedlinePlus
Research & Guidelines
- PubMed: Nitrite Clinical GuidelinesNCBI / PubMed
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
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