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Urine culture is a laboratory test used to detect and identify bacteria or other microorganisms that may be causing a urinary tract infection (UTI). This test is commonly ordered when a patient experiences symptoms such as frequent urination, burning sensation during urination, lower abdominal pain, cloudy or foul-smelling urine, or fever. The test helps healthcare providers determine the specific type of bacteria causing the infection and which antibiotics will be most effective for treatment.

The urine culture procedure begins with collecting a clean-catch urine sample, typically the first morning urine, which provides the most concentrated specimen. Patients are instructed to clean the genital area thoroughly before collection to minimize contamination from skin bacteria. The midstream portion of urine is collected in a sterile container, avoiding the initial and final portions of the urination. Proper collection technique is essential for accurate results, as contaminated samples can lead to false positive results.

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, allowing any bacteria present to multiply and form visible colonies. Laboratory technicians examine these colonies, count them, and identify the specific types of bacteria. A significant bacterial count, typically 100,000 colony-forming units per milliliter or higher, usually indicates a urinary tract infection. Lower counts may suggest contamination or early infection, depending on the clinical context and symptoms.

After identifying the bacteria, the laboratory performs antibiotic sensitivity testing, also known as susceptibility testing. This additional step determines which antibiotics will be most effective against the specific bacteria found in the urine sample. The results guide physicians in selecting the appropriate antibiotic treatment, helping to ensure effective therapy while reducing the risk of antibiotic resistance. Complete urine culture results, including bacterial identification and sensitivity testing, are typically available within 48 to 72 hours of sample collection.