Question: How to diagnose What I need to know about My Child's Urinary Tract Infection ?
Answer: A UTI is diagnosed by testing a sample of your childs urine. The way the urine is collected depends on your childs age: The health care provider looks at the urine sample with a microscope to check for bacteria or pus. The sample is also sent to a lab. The lab performs a urine culture by placing the sample in a tube or dish with a substance that encourages any bacteria present to grow. The bacteria that grow can be identified and tested to see which medicines will work best to treat the infection. A urine culture usually takes 1 to 3 days to complete.
Source: NIDDK