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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.
What is BUN in a blood test? Those three letters stand for blood, urea, and nitrogen. A BUN test measures the level or urea nitrogen present in your blood, and can contain important information about the status of your kidneys and liver. The BUN test is usually ordered if your doctor needs to evaluate your kidney function, or suspects kidney damage.