Nitrite
- Sample Type
- Standard
- Fasting
- No
- Unit
- qualitative
The Nitrite test is a biochemical marker for bacteriuria, specifically involving organisms that possess the enzyme nitrate reductase. These bacteria (mostly Gram-negative such as E. coli, Klebsiella, and Proteus) convert dietary nitrates into nitrites while residing in the bladder. Within a Urine Routine panel, a positive nitrite result is highly specific for a Urinary Tract Infection (UTI), although it is not highly sensitive, as it requires the urine to be held in the bladder for at least 4 hours for the conversion to occur.
Why Context Matters
False negatives are common if the urine is dilute, if the bladder was recently emptied, or if the infection is caused by bacteria that do not reduce nitrate (e.g., Enterococci, Staphylococci). High doses of Vitamin C can also interfere with the chemical reaction on the dipstick.
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
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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