Blood Urea Nitrogen

BUN (Blood Urea Nitrogen), BUN:Creatinine Ratio, Urea Nitrogen, Blood

What To Think About

• A BUN test may be done with a blood creatinine test. Blood urea nitrogen (BUN) and creatinine tests can be used together to find the BUN-to-creatinine ratio (BUN:creatinine). For more information, see the medical test Creatinine and Creatinine Clearance.
• BUN levels may be measured regularly in people who have kidney dialysis. BUN levels are used to see how well dialysis is working.
• A glomerular filtration rate may be done for people with chronic kidney disease to regularly check how well the kidneys are working.

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Author:	Monica Rhodes	Last Updated: August 12, 2008
Medical Review:	E. Gregory Thompson, MD - Internal Medicine Tushar J. Vachharajani, MD, FASN, FACP - Nephrology
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