Observational study.

Febrile urinary infections account for 5% of unexplained causes of fever in children up to 2 years of age. Urinary samples are therefore very common in pediatric emergencies. In children who have not acquired cleanliness, the most used method of collection is the placement of a sterile urine bag on the perineum. It allows a noninvasive urinary collection. However from a bacteriological point of view this method is debatable because the rate of contamination of the collections is important. This mode of collection is of interest only to exclude a urinary infection, by the realization of a urinary strip.

Pocket-collected urine is not reliable for bacteriological analysis in culture. For example, if the urine strip is positive, the American Academy of Pediatrics recommends urine sampling by urine sampling (or other invasive methods) for culture.

The urine bag should be changed every 30 minutes to avoid the risk of contamination. The technique is wait-and-see, the installation of several pockets is often necessary before obtaining urine.

A study carried out in 2014 shows that in 39.4% of the cases the withdrawal of the urinary pouch was as much more painful than the urinary sounding, in the same patient. To our knowledge there is no other study dealing with the difference in pain engendered by these two methods.

Since the urinary catheterization is faster, bacteriologically justified and necessary if the pocket collection is positive, it seems legitimate to ask ourselves if we should not aim at a generalization of the urinary catheterization, as first intention, Having not acquired cleanliness, requiring a withdrawal of urine for suspicion of urinary infection.

Many centers continue to use urinary pocket collection mainly, as the survey technique seems too invasive and painful.

Inclusion Criteria:

Children under 3 years of age who have not acquired the cleanliness present at the pediatric emergency department in Rennes, where urine sampling is necessary in case of suspected urinary tract infection.

Children under 3 years of age who have not acquired the cleanliness present at the pediatric emergency department in Rennes, where urine sampling is necessary in case of suspected urinary tract infection.