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A blood urea nitrogen (BUN) or urea test measures the amount of nitrogen in your child's blood that comes from the waste product urea. Urea is made in the liver. It's passed out of your child's body in the urine. If your child's kidneys can't remove urea from the blood normally, the urea level rises. Dehydration can also make your child's urea level higher.
A urea test may be done with a blood creatinine test. The level of creatinine in your child's blood also tells how well your child's kidneys are working. A high creatinine level may mean that your child's kidneys aren't working as they should. Urea and creatinine tests can be used together to find the urea-to-creatinine ratio.
A urea test is done to:
Don't let your child eat a lot of meat or other protein in the 24 hours before the urea test.
A health professional uses a needle to take a blood sample, usually from the arm.
Follow-up care is a key part of your child's treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse call line if your child is having problems. Ask your doctor when you can expect to have your child's test results.
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Adaptation Date: 3/22/2021
Adapted By: Alberta Health Services
Adaptation Reviewed By: Alberta Health Services
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