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Nitrites

Urine_hematology Unit: Urine test

Bacterial conversion of nitrate to nitrite; UTI marker

Also known as: Urine Nitrites

Reference Ranges

Clinical Reference

Positive = bacterial infection likely

Related Conditions

Urinary Tract Infection High

Food & Lifestyle Recommendations

🍎 Food Drink plenty of water and consider cranberry products to support urinary tract health Hydration and cranberry proanthocyanidins reduce bacterial adhesion in the urinary tract

Evidence-Backed Supplements

When High

  • Probiotics Tier A May Decrease

    Moderate evidence; probiotics prevent recurrent UTIs, reducing nitrite-positive infections.

    Multi-strain probiotic (Lactobacillus + Bifidobacterium) 5–50 billion CFU/day Morning on empty stomach
    PMID 36001877 PMID 25927096 PMID 32128794
  • Vitamin C Tier A May Decrease

    Limited evidence; vitamin C acidifies urine, creating hostile environment for nitrite-producing bacteria.

    Ascorbic acid 250–500 mg/day Divided doses
    PMID 26415762 PMID 28301692 PMID 23440782

Questions to Ask Your Doctor

  • Does a positive nitrite test confirm I have a urinary tract infection? Positive nitrites strongly suggest bacterial UTI; however, not all UTI-causing bacteria produce nitrites.

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