Urine Culture

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Test Overview

A urine culture is a test to find and identify germs (usually bacteria) that may be causing a urinary tract infection (UTI). Urine in the bladder normally is sterile—it does not contain any bacteria or other organisms (such as fungi). But bacteria can enter the urethra during urination.

A urine sample is kept under conditions that allow bacteria and other organisms to grow. If few organisms grow, the test is negative. If organisms grow in numbers large enough to indicate an infection, the culture is positive. The type of organisms causing the infection are identified with a microscope or by chemical tests.

Urinary tract infections are more common in women and girls than in men. This may be partly because the female urethra is shorter and closer to the anus, which allows bacteria from the intestines to come into contact more easily with the urethra. (See an illustration of the female urinary tract .) Men also have an antibacterial substance in their prostate gland that reduces their risk.

If the urine culture is positive, other tests may be done to help choose which antibiotic will do the best job treating the infection. This is called sensitivity testing.

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Last updated:	June 20, 2006
Author:	Sydney Youngerman-Cole, RN, BSN, RNC
Reviewed By:	William M. Green, MD - Emergency Medicine, W. David Colby, MSc, MD, FRCPC - Infectious Disease
Editors:	Susan Van Houten, RN, BSN, MBA, Tracy Landauer

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