![]() Normal BUN values in the elderly may be elevated. Women in the second or third trimester of pregnancy may present with a lower BUN value as normal. Females have lower normal BUN values than males. Hence, products of protein breakdown are excreted from the body. Some of the urea nitrogen is reabsorbed back into the body for further use, but most is left in the urine. Once in the blood, urea nitrogen is carried to the kidneys to be filtered out of the blood into the urine. Urea can be measured by nitrogen in the blood. BUNĪs a normal part of protein metabolism in the liver, protein is broken down into a compound called urea. The BUN-creatinine ratio is a value measured in the blood to help assess the health of the kidney. ![]() The BUN-creatinine ratio is also obtained to assess the degree and effectiveness of kidney filtration prior to some radiology studies. It is commonly measured in patients before a surgical procedure to assess general function, after some types of surgical procedures, and in patients with kidney disease or failure. DemographicsīUN-creatinine ratio is obtained whenever medically appropriate regardless of age, gender, or race. The BUN-creatinine ratio is obtained to assess normal kidney function, help identify possible kidney diseases, to monitor the progression of kidney disease, or to monitor the effectiveness of medications in treating kidney disease. The BUN-creatinine ratio provides specific clinical information about the kidney that can be used for multiple purposes. The ratio of BUN to creatinine is a relationship between these two end products found in blood, and paints a clinical picture for physicians describing kidney functionality. Creatinine is a normal waste product of muscle. BUN represents the amount of nitrogen produced from the metabolism of proteins. Definition Why BUN-creatinine is measured Demographics Description BUN-creatinine ratio and acute renal failure How to prepare for a BUN-creatinine ratio test Risks associated with testing the BUN-creatinine ratio Definitionīlood Urea Nitrogen (BUN) and creatinine are both waste products of normal metabolism in the human body.
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