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Nitrite in urine (qualitative)

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

This test checks for the presence of nitrite in your urine, which can help identify certain types of urinary tract infections (UTIs).

Quick summary

["Nitrite in urine is a simple screening test for UTIs caused by bacteria that convert nitrates to nitrites."]

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

Key facts at a glance

LOINC
96293-6
Short code
Sodium nitrite IgE Qn
Synonyms
Sodium nitrite IgE Qn
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

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like frequent urination, pain or burning during urination, cloudy or strong-smelling urine, or fever. It helps determine if a urinary tract infection is present, especially in cases where other tests or symptoms suggest infection.

How the Test Works

Nitrite in urine is detected through a chemical reaction in a urine dipstick test. Bacteria in your urine can convert nitrates (found naturally in urine) into nitrites. If nitrites are present, the test strip changes color to indicate a positive result.

What to Expect Before the Test

No special preparation is needed for this test. You can urinate normally before coming to the lab or clinic. If you are taking certain medications (like some antibiotics or nitrates), let your provider know as it may affect results.

What to Expect During the Test

You will urinate into a clean container or use a urine dipstick. The dipstick is inserted into the urine stream or dipped into the urine sample. The test is quick and painless.

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

Frequently asked questions

What does a positive nitrite test mean?
A positive nitrite test indicates that certain bacteria are likely present in your urine, which may suggest a urinary tract infection. However, it is not definitive on its own and should be evaluated with other symptoms and tests.
Can a negative nitrite test rule out a UTI?
No, a negative nitrite test does not definitively rule out a UTI. Some bacteria do not produce nitrites, so other tests or clinical evaluation may be needed to diagnose an infection.
How often should I get this test?
This test is typically done as a screening tool when you have symptoms of a UTI. Your healthcare provider will determine how often you need it based on your symptoms and medical history.
  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