Understanding Your Medical Test: What It Is, Why You Need It, and How to Prepare for Reliable Results
A urine culture test detects and identifies bacteria in urine to diagnose urinary tract infections (UTIs).
{"The test identifies bacteria causing urinary tract infections","A clean urine sample is required for accurate results","Results typically take 24-48 hours","Positive results confirm a UTI and help guide antibiotic treatment","The test measures the number of bacteria per volume of urine"}
Key facts at a glance
- LOINC
- 100906-7
- Short code
- UCULT
- Synonyms
- Bacteria # Ur Cult
- Category
- chemistry
- Sample
- urine
- Container
- Sterile, leak-proof urine collection container with boric acid preservative (gray-top) or sterile container without preservative for prompt delivery
- Units
- N/A
- Ref low
- 0
- Ref high
- 9999
- Critical range
- — – 100000 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–120 years
- Method
- culture
- CPT
- 87086
- SNOMED
- 44254004
- 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. Boric acid-preserved urine: room temperature ≤48 hours, refrigerated ≤72 hours. Specimens should be cultured as soon as possible after collection
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 24–72 hours
- Order
- routine
What is this test? This test is a laboratory examination that measures specific substances or markers in your body. It helps your doctor evaluate your overall health, screen for certain medical conditions, and monitor how well a treatment you may be receiving is working over time.
A urine culture is a laboratory test that detects bacteria or fungi in your urine. The test can identify the specific type of microorganism causing a urinary tract infection (UTI) and determine which antibiotics will be most effective for treatment. During the test, a urine sample is placed in a special environment that allows bacteria to grow, making it possible to count and identify them.
Why do I need this test? Your doctor has ordered this test to gather important information about your health. It can help confirm or rule out a medical condition, explain symptoms you have been experiencing, or track changes in your body so your care plan can be adjusted as needed.
Your healthcare provider may order a urine culture if you have symptoms of a urinary tract infection, such as pain or burning during urination, frequent urination, cloudy or strong-smelling urine, or pelvic pain. The test is also used to confirm a UTI diagnosis, identify the specific cause of infection, and guide appropriate antibiotic treatment. It may also be performed during pregnancy or before certain medical procedures to check for asymptomatic infections.
How should I prepare for the test? Preparation depends on the type of test being performed. Your doctor may ask you to fast for a certain number of hours, avoid certain foods or medications, or drink extra water beforehand. Follow all instructions you receive, and tell your care team about every medication and supplement you take.
To ensure accurate results, collect a clean-catch urine sample. This involves cleaning the genital area with provided wipes, beginning to urinate into the toilet, then collecting the middle portion of urine flow into a sterile container. It is best to collect the sample first thing in the morning or at least 2 hours after last urination. Inform your healthcare provider about any antibiotics you are currently taking, as they may affect the results.
What do the results mean? Your results will show whether your measured values fall within the expected reference range. Values that are higher or lower than normal may point to a condition that needs further evaluation, but many factors can affect the numbers. Your doctor will review the results with you, explain what they mean, and discuss any next steps.
Results are typically reported as colony forming units per milliliter (CFU/mL). A result of 100,000 CFU/mL or more of a single bacterium usually indicates an active infection. Results between 1,000-100,000 CFU/mL may suggest contamination or an early infection. Results below 1,000 CFU/mL are usually considered normal or indicate contamination. Your healthcare provider will interpret your results along with your symptoms to determine if treatment is needed.
Reference range
No growth or <10,000 CFU/mL (10^4 CFU/mL) typically considered negative or not clinically significant; ≥100,000 CFU/mL (10^5 CFU/mL) of a single uropathogen considered significant bacteriuria. Interpretation depends on clinical context, specimen type (clean-catch vs. catheterized), and patient symptomsN/A
Collect midstream clean-catch urine specimen. Patient should wash hands and clean urethral meatus with antiseptic wipes before collection. For catheterized patients, sample should be aspirated from the catheter port, not the drainage bag. First morning void is preferred for optimal organism recovery. Avoid contamination with vaginal, perineal, or fecal flora
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
The urine culture test is essential for diagnosing urinary tract infections, which are among the most common bacterial infections. It helps distinguish between a true infection and conditions with similar symptoms. The test identifies the specific pathogen causing the infection, allowing for targeted antibiotic therapy rather than using broad-spectrum antibiotics. This targeted approach helps combat antibiotic resistance. The test is particularly important for recurrent UTIs, complicated UTIs, and infections that do not respond to initial treatment. In pregnant women, urine culture screening helps prevent complications that can affect both mother and baby.
Frequently asked questions
How long does it take to get results?
Does a positive result always mean I have an infection?
Can I do the test at home?
What happens if my test results are negative but I still have symptoms?
Sources
- 1
- 2Mayo Clinic - UrinalysisSource
- 3
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.
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