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.
Go to https://www.healthwise.net/patientEd
Enter Y870 in the search box to learn more about "Blood Urea Nitrogen (BUN) Test: About This Test."
Current as of:
November 20, 2015
Adam Husney, MD - Family Medicine
© 2006-2017 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
Care instructions adapted under license by your healthcare professional. If you have questions about a medical condition or this instruction, always ask your healthcare professional. Healthwise, Incorporated disclaims any warranty or liability for your use of this information.