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Quick Answer. A high BUN count usually indicates that the kidneys are not working properly, but there are other issues that can cause high results, as stated by Mayo Clinic. Some other causes for a high BUN count are a high protein diet, dehydration and congestive heart failure. BUN is an acronym for blood urea nitrogen, and results can vary depending on an individual's age as well as the lab that processes the test, as explained by Mayo Clinic. Shock, severe burns and some medications, such as certain antibiotics, can also cause higher-than-normal BUN results. Doctors consider a BUN test a standard type of blood test and use it to measure the amount of urea nitrogen in the blood. The liver breaks down proteins in the body, which causes ammonia production, according to Mayo Clinic.
Some medicines are processed by the kidneys or can cause kidney damage as a side effect. The BUN test may be done to be sure you have normal kidney function before you start taking these medicines. What does the test result mean? The normal range for BUN is 7 to 20 milligrams per deciliter (mg/dL). The normal range may vary slightly from lab to lab. Normal ranges are usually shown next to your results in the lab report. Your BUN level may be higher than normal because: Your kidneys aren't working well.