The liver breaks down proteins in the body, which causes ammonia production, according to Mayo Clinic. Doctors consider a BUN test a standard type of blood test and use it to measure the amount of urea nitrogen in the blood. Shock, severe burns and some medications, such as certain antibiotics, can also cause higher-than-normal BUN results. “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. Some other causes for a high BUN count are a high protein diet, dehydration and congestive heart failure. What Does a High BUN Count Mean?Ī 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. But if you’re getting other blood tests, your doctor may give you directions that may include fasting before the test. If you’re only getting a BUN test, you can eat and drink. If any of them might alter the test result, your doctor may ask you to stop taking them for a period of time. Overhydration (too much water in your body).īefore the blood test, tell your doctor what medications you’re taking.However, you may have low BUN levels from the following: Blockage in your urinary system that prevents you from peeing.Certain medications, including carbamazepine, methotrexate and tetracycline.Aging (infants and children have lower BUN levels).However, even if your kidneys are working properly, you may have elevated BUN levels from the following: High BUN levels may suggest that your kidneys aren’t working as they should. See also One Month Old with Cold: Symptoms and Care Tips What does high blood urea nitrogen mean? However, if your BUN numbers are higher than your baseline, and if your creatinine (a waste product from muscle tissue breakdown) is also high, then kidney failure is likely. Healthcare providers don’t use BUN to define kidney failure. What level of urea indicates kidney failure? Age and SexĪdult women and people assigned female at birth.Īdult men and people assigned male at birth. What is a normal blood urea nitrogen level?Ī normal blood urea nitrogen level varies according to your age and sex. Swelling, particularly in your hands, feet and ankles.Symptoms of later-stage kidney disease may include: If you have symptoms of later-stage kidney disease, it’s a good idea to get a BUN test. Biological family history of kidney disease.The early stages of kidney disease don’t have any symptoms, but the following factors may put you at a higher risk: A healthcare provider may recommend a BUN test during a checkup as part of a comprehensive metabolic panel (CMP) or basic metabolic panel (BMP) blood test.Ī provider may also recommend a BUN test if you have a higher risk of kidney disease.
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