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Bacteriaurcultorg3

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

A laboratory test that identifies and analyzes bacteria found in urine to diagnose urinary tract infections.

Quick summary

{"This test identifies specific bacteria causing a urinary tract infection (UTI)","A clean urine sample is collected and sent to a laboratory for analysis","Results help doctors determine the most effective antibiotic treatment","The test typically takes 2-3 days for complete results","A positive result confirms bacterial infection in the urinary tract"}

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

Key facts at a glance

LOINC
17971-3
Short code
UCID3
Synonyms
Bacteria Ur Cult org #3
Category
chemistry
Sample
urine
Container
Sterile, leak-proof urine collection container with preservative (boric acid) or without preservative for immediate transport
Units
N/A
Ref low
0
Ref high
10
Fasting
false
Population
adult
Sex
all
Age range
0–120 years
Method
culture
CPT
87088
SNOMED
117030006
Specimen volume
10-50 mL of urine; minimum 1 mL for culture
Stability
Unpreserved urine: room temperature ≤2 hours, refrigerated (2-8°C) ≤24 hours. Urine with boric acid preservative: room temperature ≤24 hours, refrigerated ≤48 hours. Specimens should be processed as soon as possible after collection to prevent bacterial overgrowth.
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
24–72 hours
Order
routine

What is this test?

A urine culture is a diagnostic test that detects and identifies bacteria or fungi in urine. When your doctor suspects a urinary tract infection (UTI), they order this test to determine the exact microorganism causing the infection. The test involves collecting a urine sample and placing it in a special environment that allows bacteria to grow. Laboratory technicians then identify the specific type of bacteria present and test which antibiotics can effectively treat the infection.

How is the test performed?

You will be asked to collect a clean-catch urine sample. This involves cleaning the genital area, beginning to urinate, and then collecting the middle portion of urine flow in a sterile container. The sample is then sent to a laboratory where it is placed on growth media. If bacteria are present, they will multiply and form colonies within 24-48 hours. Technicians will then identify the specific bacteria and perform antibiotic sensitivity testing to determine which medications will work best.

Why is this test important?

This test is crucial because it not only confirms the presence of a bacterial infection but also identifies the exact type of bacteria causing the problem. Different bacteria require different treatments, and some may be resistant to certain antibiotics. By identifying the specific microorganism, doctors can prescribe the most appropriate and effective treatment, avoiding trial-and-error prescribing and reducing the risk of antibiotic resistance.

Reference range

No growth of clinically significant bacteria (typically <10,000 CFU/mL for voided urine; <1,000 CFU/mL for catheterized specimens). Interpretation depends on bacterial species, colony count, clinical context, and specimen type.N/A

Specimen: urine

Ideally, patients should be instructed to collect a clean-catch midstream urine specimen. Genital area should be cleaned with antiseptic wipes prior to collection. First morning void is preferred for optimal bacterial yield. Avoid contamination with vaginal flora or perineal bacteria.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Does a positive result always mean I have an infection?
Not necessarily. Some bacteria may be present in urine without causing an infection (asymptomatic bacteriuria), particularly in elderly patients or those with diabetes. Your doctor will interpret the results along with your symptoms and other test findings to determine if treatment is needed.
How long does it take to get results?
Initial results showing bacterial growth are typically available within 24-48 hours. Complete identification and antibiotic sensitivity results usually take 2-3 days. If no bacteria grow after 48-72 hours, the culture is considered negative.
Do I need to prepare for this test?
No special preparation is needed. However, it is important to collect a clean-catch urine sample to avoid contamination. Drink normally and do not restrict fluids unless instructed by your doctor. Inform your doctor about any antibiotics you are currently taking, as they may affect results.
What happens if the test shows no bacterial growth?
If no bacteria grow in the culture after 48-72 hours, it typically means there is no bacterial urinary tract infection. Your doctor will consider other possible causes of your symptoms, such as viral infections, fungal infections, interstitial cystitis, or other medical conditions, and may order additional tests.
Can I collect my urine sample at home?
Yes, you can collect the sample at home using a sterile container provided by your healthcare provider or laboratory. Follow the clean-catch instructions carefully and deliver the sample to the laboratory within the time frame specified (usually within 1-2 hours). If unable to deliver quickly, refrigerate the sample, but do not freeze it.
  1. 1
    Urine Culture: MedlinePlus Medical EncyclopediaSource
  2. 2
    Urinary Tract Infection - Diagnosis: Mayo ClinicSource
  3. 3
    Urine Culture: Johns Hopkins MedicineSource

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