![]() However, it's important to note that the specific reference range provided by the laboratory conducting the test should be considered. On average, for adults, the normal range of BUN is between 6 to 20 milligrams per deciliter (mg/dL). The normal range of BUN differs across age groups and can vary based on different factors and the laboratory's reference range. While measuring BUN levels, healthcare professionals generally evaluate blood urea nitrogen/creatinine ratio (BUN/Cr) to assess kidney function. BUN measures the concentration of nitrogen in the blood that comes from urea. The kidneys filter out urea from the bloodstream and eliminate it through urine. These byproducts are released into the bloodstream and carried to the liver, where they are converted into urea. Urea is a waste product generated by our bodies' breaking down proteins into amino acids, which are further broken down into ammonia and carbon dioxide. To understand BUN, we need to understand its basic science. This guide is intended to provide general information and insights into BUN and should not serve as a substitute for medical advice. Therefore, it's always recommended to follow the advice of a healthcare professional. Before delving into the various aspects of BUN, it's important to note that interpreting BUN results can be complex. In this comprehensive guide to BUN, we will explore the science behind BUN, how to interpret BUN results, its significance in kidney function, and the clinical applications of BUN. BUN is an essential laboratory test that provides crucial information about our body's metabolic activity and can help diagnose various medical conditions. BUN is a laboratory test that detects the amount of urea nitrogen in your blood, which is a byproduct of protein metabolism targeted by the kidneys to filter out of the body via urine. Some disorders related to a low BUN level in the blood are pregnancy and acromegaly.Blood Urea Nitrogen, or BUN, is a common term you might come across during your routine medical checkup. If kidneys do not work properly urea remains in the bloodstream and its concentration in the blood will be abnormally higher.Ī BUN level below the normal range may be a sign of a low-protein diet or a liver disorder (the liver is not doing a proper protein metabolism). Kidney disorders ( kidney failure, nephropathies, etc.).High protein catabolism (due to an excessive consumption of proteins, etc.).A decrease in the plasma volume due to dehydration or upper GI (gastrointestinal) bleeding.Urea level in the blood is directly related to nutrition, protein metabolism/catabolism and renal functionality.Ī high level of BUN in the blood may be due to: Urea is a marker for kidneys and liver activity. Maximum values increase with the age and are higher in elderly people. Age is an important factor to normal ranges.If your test is expressed in urea you must convert the values from urea to BUN or the information given will not be specific for your case. Warning: In this page we talk about BUN levels. It important to know if the values measured are the BUN levels used in the US and other countries or instead the values measured are the total urea used in Europe and around the world.There are some circumstances to take into account about BUN normal ranges in the blood: Your doctor will study the results along with your medical record, screenings, physical condition, symptoms and any other relevant information about your situation. There may be also slight differences in the normal levels according to age, gender, race or ethnic origin, geographic region, diet, type of sample and other relevant status. These ranges depend on the makeup of the local population, the technologies used and the accuracy of the measurement. ![]() Each laboratory must establish its own normal ranges for BUN in the blood.
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