![]() ![]() A high creatinine level may signal problems with the kidneys or heart, but if it’s slightly elevated, it could simply mean that your diet is high in protein. The level of creatinine in your blood also tells how well your kidneys are working. BUN/Creatinine RatioĪ BUN test is usually done with a blood creatinine test. ĭecreased or elevated BUN concentrations are usually seen in pregnancy. The range is wide because of normal variations due to protein intake, protein breakdown, state of hydration, liver urea production, and urea elimination by the kidneys. To convert from mg/dL of blood urea nitrogen to mmol/L of urea, multiply by 0.357. Normal human adult blood should contain between 5 to 20 mg of urea nitrogen per 100 ml (5 to 20 mg/dL) of blood, or 1.8 to 7.1 mmol urea per liter. The BUN is roughly one-half of the blood urea. ![]() In Europe, the whole urea molecule is measured, whereas in the United States only the nitrogen component of urea is measured (the blood or serum urea nitrogen, i.e., BUN or SUN). By doing so, you and your healthcare provider can gain clues to help identify possible conditions or diseases. Your healthcare provider will compare your lab test results with reference values to see if any of your results fall outside the range of expected values. Lab results are commonly shown as a set of values known as a reference range, which is sometimes referred to as a “normal range.” A reference range includes upper and lower limits of a lab test based on a group of otherwise healthy people. ![]() BUN is far more likely to be affected by dietary and physiologic conditions unrelated to kidney function. However, creatinine is a much more reliable marker of kidney function. Therefore, BUN is an indicator of kidney health and/or liver health. What Your BUN Levels MeanīUN levels represent the balance between : See if your kidneys are working normally or if kidney disease is progressingĪny standard blood test will have BUN or urea numbers.Ĭonventional doctors will look at high or low BUN numbers and not mention anything, but these can indicate that certain processes in the body aren’t optimal.Ī blood urea nitrogen (BUN) test is performed to: During exercise, a substantial amount may be lost through sweat. Ī small amount of urea (less than 0.5 g/day) is lost through the gut, lungs, and skin. īeing a diuretic, urea helps the kidneys quickly flush water and other compounds. The bulk of the urea, about 10 g each day, is eliminated by the kidneys. On a normal diet, we produce about 12 g of urea each day. Urea is created not only from dietary protein, but also from protein in your tissues. It binds excess nitrogen from used-up proteins and safely removes it from the body. The liver produces urea as a waste product of proteins breakdown. This post covers the causes of high and low blood urea nitrogen (BUN) and what they may mean for you.īlood urea nitrogen ( BUN) is a measure of the amount of urea in the blood. Testing urea levels in the blood provides information about your health. A plus sign next to the number “” means that the information is found within the full scientific study rather than the abstract. If you feel that any of our content is inaccurate, out-of-date, or otherwise questionable, please leave a comment or contact us at that each number in parentheses is a clickable link to peer-reviewed scientific studies. Our goal is to not have a single piece of inaccurate information on this website. They are continually monitored by our internal peer-review process and if we see anyone making material science errors, we don't let them write for us again. Our science team must pass long technical science tests, difficult logical reasoning and reading comprehension tests. Our science team is put through the strictest vetting process in the health industry and we often reject applicants who have written articles for many of the largest health websites that are deemed trustworthy. Our team comprises of trained MDs, PhDs, pharmacists, qualified scientists, and certified health and wellness specialists.Īll of our content is written by scientists and people with a strong science background. We are dedicated to providing the most scientifically valid, unbiased, and comprehensive information on any given topic. We believe that the most accurate information is found directly in the scientific source. SelfDecode has the strictest sourcing guidelines in the health industry and we almost exclusively link to medically peer-reviewed studies, usually on PubMed.
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