• Cécile Etoubleau, Marianne Reveret, Delphine Brouet, Isabelle Badier, Philippe Brosset, Laurent Fourcade, Claire Bahans, Fabien Garnier, Philippe Blanc, and Vincent Guigonis.
• Department of Pediatrics, Limoges University Hospital, Hôpital de la Mère et de l'Enfant, Limoges, France.
• J. Pediatr. 2009 Jun 1; 154 (6): 803-6.

ObjectiveTo compare, in the same children, urine culture results from bag- versus catheter-obtained specimens with catheter culture as the reference.Study DesignA total of 192 non-toilet-trained children <3 years of age from 2 emergency departments were recruited for this prospective cross-sectional study. All had positive urinalysis results from bag-obtained specimens that were systematically checked with a catheter-obtained specimen before treatment. Results of comparison of urine cultures obtained with these 2 collecting methods are presented.ResultsA total of 7.5% of bag-obtained specimen positive cultures had false-positive results. Twenty-nine percent of bag-obtained specimen cultures with negative results were false negative. Altogether, bag-obtained specimens led to either a misdiagnosis or an impossible diagnosis in 40% of cases versus 5.7% when urethral catheterization was used.ConclusionEvery bag-obtained positive-result urinalysis should be confirmed with a more reliable method before therapy.

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