The urinalysis is the most important initial study in the evaluation of the patient suspected of having a UTI. A negative urinalysis makes the diagnosis of UTI unlikely. A simple midstream sample voided into a sterile container is sufficient and the more difficult and elaborate clean-caught midstream urine has not been found to be superior.
If the urine sample cannot be examined within 10 -15 minutes of obtaining it, it must be refrigerated. Uncentrifuged urine can be examined with a microscope (immersion lens) under a cover slip. The finding of bacteria by this method has a 90% correlation with the culture of >
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