A 63-year-old asymptomatic female’s clean-catch midstream ur…
A 63-year-old asymptomatic female’s clean-catch midstream urine was inoculated onto sheep blood agar with a 1µl inoculating loop. It was also plated onto CNA and MacConkey agar. After 24 hours incubation, there were 185 colonies counted on the sheep blood agar. The colonies were white, creamy, nonhemolytic colonies on sheep blood agar and CNA. There was no growth on the MacConkey agar plate. Based on the attached chart, this specimen represents: Specimen Source Colony Count/ml (Pure Culture) Interpretation Suprapubic aspiration Gram negative bacilli; any number >99% probability of infection Gram positive bacilli; >103 >99% probability of infection Catheterization >105 >99% probability of infection 104-105 Suggestive infection 103-104 Likely infection 105 >99% probability of infection Clean voided (female) >105 80% probability of infection 104-105 Indeterminate; treat as infection if pt is symptomatic
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