Taking urine samples from a child, especially one who is not potty trained, can be interesting to say the least. Sometimes the doctors will want to catheterize the child to get a good clean sample, but there are ways to take samples with a collection bag.

If the child is in a diaper, cut a slit in the diaper for the collection bag to hang trough. This keeps the collection bag from bunching up inside the diaper, and you can see when there is urine in it and can remove the bag before the urine can leak.