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...Percentage distribution of etiologic agents urinary tract infections among outpatients and inpatients by specimen collection suprapubic aspiration the best method to avoid contamination invasive uncomfortable straight catheter technique next for obtaining urine specimens with minimal too labor intensive costly routine use clean catch midstream neither nor simple inexpensive can be performed in almost any clinical setting there is no risk introducing bacteria into bladder complications colony counts from collected this correlate reasonably well those via or catheterization obvious disadvantage sample passes through distal urethra become contaminated commensal discouraged culture catheters place more than a few hours if required must taken sampling port newly inserted device foley tips diversions such as ileal loops chronic nephrostomy collections bagged procedures decrease rate cleansing skin mucous membranes adjacent urethral orifice before micturition collecting mandatory information ...