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Nitrite concentration in urine (mass concentration)

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 testing helps identify possible urinary tract infections caused by bacteria that produce nitrite."]

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

Key facts at a glance

LOINC
48290-1
Short code
Sodium nitrite LR-mCnc
Synonyms
Sodium nitrite LR-mCnc
Category
electrolyte
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
136
Ref high
145
Critical range
120 N/A – 160 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84295
SNOMED
110741000
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What Is Nitrite Testing Used For?

Nitrite testing is primarily used as a screening tool for urinary tract infections (UTIs). Bacteria like *Escherichia coli* convert nitrates in urine into nitrites, which the test detects. This can signal infection, though it’s not definitive on its own.

How Is the Test Performed?

You’ll likely provide a midstream urine sample (clean-catch) or a urine specimen collected in a container. The test involves a dipstick or chemical reagent that changes color if nitrite is present, which is then interpreted by a healthcare provider.

What Does a Positive Result Mean?

A positive result suggests that nitrite may be present, which could indicate bacterial infection in your urinary tract. However, false positives can occur, so further testing (like a urine culture) may be needed to confirm.

What Does a Negative Result Mean?

A negative result means no nitrite was detected, which may mean no bacterial infection is present or that the bacteria present do not produce nitrite. It does not rule out infection entirely, so other tests may still be needed.

Reference range

Adult: 136-145 mmol/LN/A

Specimen: serum

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Urine Nitrite

Frequently asked questions

Why might my nitrite test be positive if I don’t have symptoms of a UTI?
Nitrite testing can sometimes yield false positives due to factors like dietary nitrates (e.g., processed foods), certain medications, or contamination. If you’re unsure, discuss your results with your healthcare provider to clarify next steps.
What if my nitrite test is negative but I still feel like I have a UTI?
A negative nitrite test doesn’t rule out a UTI entirely. Some infections may not produce nitrite, or other bacteria may be present. Your provider may recommend additional tests, such as a urine culture or other diagnostic methods, to investigate further.
How often should I get a nitrite test if I have recurring UTIs?
If you have recurrent UTIs, your healthcare provider may recommend regular screening tests, including nitrite testing, along with lifestyle changes (like hydration and proper hygiene) or other preventive measures. Follow their guidance for personalized advice.
  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