A blood urea nitrogen (BUN) test measures the amount of nitrogen in your blood that comes from the waste product urea. Urea is made in the liver and passed out of your body in the urine. If your kidneys are not able to remove urea from the blood normally, your BUN level rises. Dehydration can also make your BUN level higher.
A BUN test may be done with a blood creatinine test. The level of creatinine in your blood also tells how well your kidneys are working. A high creatinine level may mean your kidneys are not working properly. BUN and creatinine tests can be used together to find the BUN-to-creatinine ratio.
A BUN test is done to:
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse call line if you are having problems. It's also a good idea to keep a list of the medicines you take. Ask your doctor when you can expect to have your test results.
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Current as of: August 8, 2016
Adam Husney, MD - Family Medicine
& Caroline S. Rhoads, MD - Internal Medicine
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