A low BUN-to-creatinine ratio may be caused by a diet low in protein, a severe muscle injury called rhabdomyolysis, pregnancy, cirrhosis, or syndrome of inappropriate antidiuretic hormone secretion (SIADH).Women and children may have lower BUN levels than men because of how their bodies break down protein.Drinking too much liquid may cause overhydration and cause a low BUN value. The reference ranges for the BUN levels are as follows : Adult: 10-20 mg/dL or 3.6-7.A low BUN value may be caused by a diet very low in protein, by malnutrition, or by severe liver damage.A very high BUN-to-creatinine ratio may be caused by bleeding in the digestive tract or respiratory tract. High BUN-to-creatinine ratios occur with sudden (acute) kidney problems, which may be caused by shock or severe dehydration.A high BUN value may be caused by a high-protein diet, Addison's disease, or tissue damage (such as from severe burns), or from bleeding in the gastrointestinal tract.Be sure to tell your doctor about all the nonprescription and prescription medicines you take. High BUN levels can also be caused by low blood flow to the kidneys caused by dehydration or heart failure. Kidney damage can be caused by diabetes or high blood pressure that directly affects the kidneys. A high BUN value can mean kidney injury or disease is present.A value that isn't in the normal range may still be normal for you. Your doctor will also look at your results based on your age, health, and other factors. Your lab report should show the range that your lab uses for each test. A value that isnt in the normal range may still be normal for you. A BUN-to-creatinine ratio can help your doctor check for problems, such as dehydration, that may cause abnormal BUN and creatinine levels.Įach lab has a different range for what's normal. Each lab has a different range for whats normal. Blood urea nitrogen (BUN) and creatinine tests can be used together to find the BUN-to-creatinine ratio (BUN:creatinine). The level of creatinine in your blood also tells how well your kidneys are working-a high creatinine level may mean your kidneys are not working properly. Generally, a normal BUN range is between 7 to 20. Blood urea nitrogen to creatinine ratio (BUN:creatinine)Ī BUN test may be done with a blood creatinine test. The normal blood urea nitrogen (BUN) levels can vary depending on the laboratory and individual factors. A low BUN level can occur normally in the second or third trimester of pregnancy. Liver disease or damage can lower your BUN level. Heart failure, dehydration, or a diet high in protein can also make your BUN level higher. If your kidneys are not able to remove urea from the blood normally, your BUN level rises. Urea is made in the liver and passed out of your body in the urine.Ī BUN test is done to see how well your kidneys are working. Urea is made when protein is broken down in your body. A blood urea nitrogen (BUN) test measures the amount of nitrogen in your blood that comes from the waste product urea. Health Encyclopedia: Blood Urea Nitrogen. Elevated BUN levels can indicate kidney dysfunction, dehydration, urinary tract obstruction, or certain medical conditions. The normal range of creatinine levels in adults is usually between 0.6 to 1.2 mg/dL for males and 0.5 to 1.1 mg/dL for females. Rochester (NY): University of Rochester Medical Center c2022. The normal range of BUN levels in adults is typically between 7 to 20 mg/dL. As ranges can vary depending on the laboratory, it’s important to check your test result report to see what your specific lab’s reference range is. One common reference range for an AST blood test is 8 to 33 U/L (units per liter). University of Rochester Medical Center. The normal range for aspartate transferase (AST) varies from laboratory to laboratory.New York: National Kidney Foundation Inc., c2022. Department of Health and Human Services National Kidney Disease Education Program: Your Kidney Test Results. National Institute of Diabetes and Digestive and Kidney Diseases.Department of Health and Human Services Kidney Disease. Department of Health and Human Services Blood Tests. National Heart, Lung, and Blood Institute.Mayo Foundation for Medical Education and Research c1998-2022. 1 3 years, 11 36 mg/dL, 1.8 6.0 mmol/L BUN (Blood urea nitrogen) in serum/. Mayo Foundation for Medical Education and Research c1998-2022. Global, 17 43 mg/dL, 2.8 7.2 mmol/L Children.
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