Studies in the United States, and other parts of the world, have examined large numbers of children and have found that hematuria, the medical term for blood in the urine, is a relatively common finding.
In fact, two to five percent of school age children had tiny amounts of blood in their urine at some point in time during every day. About one percent of school-aged children continue to have blood in their urine when it is repeatedly tested.
While this might seem scary, most causes of hematuria are harmless. Only a very few children who continued to have hematuria had serious kidney problems. The vast majority remained perfectly healthy and the blood disappeared after a number of years.
Usually the blood cannot be seen with the naked eye and can only be detected in the laboratory using a special urine dipstick that measures blood, protein, sugar, ketones, and products from bacterial infection.
The urine dipsticks are very sensitive and turn positive with tiny amounts of blood that may be seen only when the urine is observed under the microscope (called microscopic hematuria).
Most of the time blood in the urine causes no pain to your child. Even when blood is visible to the naked eye, it is very rarely a lot of blood, so you don’t have to worry about your child losing too much blood.