Finding the right tests…
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Finding the right tests…
Microbiology
A urine culture grows a sample of your urine to check for bacteria causing a urinary tract infection, and is the test that actually confirms a UTI rather than just suggesting one. A urine dipstick or routine exam can hint at infection within minutes, but only a culture identifies the specific bacteria involved and, through sensitivity testing, tells your doctor which antibiotic will actually work against it. This is the most frequently ordered culture test in this group, since UTIs are common and recurring or unresponsive infections need more than a guess at treatment.
This test reports which bacteria, if any, are growing in your urine and how heavily, since a small amount of bacterial growth can reflect contamination during collection rather than a genuine infection. A result significant enough to call a true infection is then tested against a panel of antibiotics, reported as sensitive, intermediate, or resistant, which is the actual information your doctor uses to choose or change a prescription rather than relying on a standard first-line drug that may not work for you.
A urine dipstick can flag signs suggestive of infection within minutes, but it doesn't identify the bacteria causing it or tell you which antibiotic will work. A culture is the step that actually grows the organism, which is why it confirms a UTI before starting or changing treatment, particularly for infections that keep coming back.
Most samples are collected using the clean-catch method: cleaning the genital area first, then collecting midstream urine into a sterile container, which reduces the chance that skin bacteria contaminate the sample. A catheter-collected sample is used instead when a clean catch isn't practical, such as in a hospitalized patient.
A small number of bacteria in urine is common and often reflects contamination from the skin rather than a genuine infection, so labs report growth as significant only above a certain threshold. That distinction is why the report separates "normal growth," meaning no infection, from a positive result naming a specific organism.
Once an organism is identified, it's tested against several antibiotics to see which stop it from growing. This is especially useful for recurrent UTIs, since bacteria that keep coming back can develop resistance to whichever antibiotic was used last time, making a fresh check more useful than repeating the same prescription.
A dipstick can suggest infection quickly, but it doesn't identify the bacteria or which antibiotic will work against it. A culture confirms the diagnosis and guides treatment, especially for recurring infections.
Use the clean-catch method: clean the genital area as instructed, start urinating into the toilet, then collect a midstream sample into the sterile container provided. This reduces contamination from skin bacteria.
It means the bacteria found were at a level considered normal contamination rather than a true infection, so no infection was detected. It isn't the same as a report showing no bacteria at all.
This page is general information about the test, not medical advice. Your own report's reference ranges apply — please discuss your results with your doctor.
Bacteria causing repeated UTIs can develop resistance to an antibiotic used previously, which is exactly why a fresh sensitivity test is useful for recurring infections rather than reusing the same prescription. Your doctor picks a new antibiotic based on the current result.
Yes, particularly during pregnancy, when a urine culture may be ordered as a screening test even without symptoms, since untreated infection during pregnancy carries added risks. Ask your doctor whether this applies to you.
There's no fasting requirement for a urine culture. Tell your doctor or the centre about any antibiotics you're already taking, since these can affect what grows in the sample.