[Proteinuria in pediatrics: from screening to diagnosis and monitoring of kidney disease].

The incidental finding of a proteinuria is a common cause of consultation in pediatric nephrology. Although it is transient in most cases, it may also be indicative of a kidney disease. For this reason, a moderate proteinuria in children should not be overlooked. Moreover, as well as in adults, proteinuria is an essential marker in the monitoring of chronic renal disease in pediatric patients. We propose to review the physiopathology of proteinuria, the screening modalities and how to deal with proteinuria in pediatric.