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Nitrite concentration in urine

Published: August 9, 2026Updated: August 16, 2026

This test measures the presence of nitrite in your urine, which can help detect certain types of bacterial infections in your urinary tract.

Quick summary

["Nitrite tests may help identify infections caused by bacteria that produce nitrite from urine components."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
32710-6
Short code
Nitrite Ur Ql
Synonyms
Nitrite Ur Ql
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Doctors may order a urine nitrite test to check for signs of urinary tract infections (UTIs). Nitrite is formed when certain bacteria break down substances in urine, and its presence can signal infection, particularly from bacteria like *Escherichia coli*. This test is often used alongside other tests, such as urine culture, to confirm or guide treatment for UTIs.

How Is the Test Performed?

A small sample of your urine is collected in a clean container. The sample is then tested using a dipstick or other rapid method to detect nitrite. Results are typically available within minutes.

What Do the Results Mean?

A positive result (presence of nitrite) suggests a higher likelihood of a bacterial UTI, though it does not confirm the exact type of bacteria. A negative result means nitrite was not detected, which may indicate no infection or that the infection is unlikely to produce nitrite.

What Are Possible Causes of Abnormal Results?

A positive nitrite test is most commonly linked to bacterial UTIs, but other factors—such as certain dietary nitrates (e.g., from processed foods)—may cause false positives. False negatives can occur if the urine sample is contaminated or if the infection is not producing nitrite.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Urine nitrite testing is a quick, non-invasive screening tool for UTIs, especially useful in settings where urine cultures may not be immediately available. While not definitive on its own, it helps prioritize further testing (like urine culture) or guide antibiotic treatment decisions. It is particularly valuable for detecting infections caused by nitrite-producing bacteria, which are common causes of lower urinary tract infections.

Short name

Urine Nitrite

Frequently asked questions

What does a positive nitrite test mean?
A positive nitrite test indicates that certain bacteria may be present in your urine and could be causing an infection. However, it does not specify which bacteria or confirm the infection. Your doctor may order additional tests, such as a urine culture, to identify the exact cause and guide treatment.
Can food or drinks affect this test?
Yes, certain foods and beverages—such as those high in nitrates (e.g., processed meats, vegetables like beets) or artificial sweeteners—may cause false positive results. If you suspect this could be an issue, discuss it with your healthcare provider before retesting.
Is this test painful or uncomfortable?
No, this test is not painful. You simply provide a urine sample, often by urinating into a clean container. The test itself involves minimal contact and is typically done as part of a routine checkup or when symptoms suggest a UTI.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy