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Urine culture is a laboratory test that detects and identifies bacteria and other microorganisms in the urine. This test is primarily used to diagnose urinary tract infections, which can affect the kidneys, bladder, ureters, or urethra. When bacteria grow in the urinary tract, they can cause symptoms such as painful urination, frequent urges to urinate, lower abdominal pain, cloudy or foul-smelling urine, and sometimes fever. A urine culture helps doctors determine whether an infection is present and which specific bacteria are causing it, allowing them to prescribe the most effective antibiotic treatment.

The test requires a urine sample, which is typically collected using the clean-catch midstream method to minimize contamination from skin bacteria. For accurate results, it is important to follow proper collection techniques. The sample should be collected in a sterile container provided by the laboratory or healthcare facility. In some cases, especially for young children or patients who cannot provide a sample voluntarily, a catheter may be used to collect urine directly from the bladder. Once collected, the sample should be transported to the laboratory promptly or refrigerated if there will be a delay.

In the laboratory, the urine sample is placed on special culture media that encourage bacterial growth. The sample is then incubated at body temperature for 24 to 48 hours. If bacteria are present, they will multiply and form visible colonies. Laboratory technicians count these colonies to determine the concentration of bacteria in the urine. A significant bacterial count typically indicates an infection, while lower counts may suggest contamination during collection. If bacteria grow, additional tests called antibiotic sensitivity or susceptibility tests are performed to identify which antibiotics will be most effective against the specific bacteria found.

Results from a urine culture usually take one to three days. A negative result means no significant bacterial growth was detected, suggesting that urinary symptoms may be due to other causes. A positive result identifies the type of bacteria present and provides information about which antibiotics will work best for treatment. Common bacteria found in urinary tract infections include Escherichia coli, Klebsiella, Proteus, and Enterococcus species. Your healthcare provider will interpret the results in the context of your symptoms and medical history to determine the appropriate treatment plan.