Monday, June 20, 2011
Urine Cultures (Lab)
Urine cultures are performed when a patient exhibits symptoms of a urinary tract infection. The presence of a single type of bacteria growing at high colony counts is considered to be a positive urine culture. If a mid stream clean catch is properly collected cultures with greater than 100,000 CFU/mL usually indicates a urinary tract infection. For urine specimens collected from a sterile site such as a catheter results of 1,000 to 100,000 could be significant. To determine the final ID the colony morphology should be examined and the appropriate tests performed. If there is no growth on a urine culture in 24-48 hours then this probably means that the patient is free from infection.
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