Also, your doctor will evaluate your results based on your health and other factors. Your lab report should contain the range your lab uses. These ranges vary from lab to lab, and your lab may have a different range for what's normal. The normal values listed here-called a reference range-are just a guide. Problems, such as dehydration, that may cause abnormal BUN and creatinine A BUN-to-creatinine ratio can help your doctor check for Tests can be used together to find the BUN-to-creatinine ratio The level of creatinine in your bloodĪlso tells how well your kidneys are working-a high creatinine level may mean Blood urea nitrogen to creatinine ratio (BUN:creatinine)Ĭreatinine test. A lowīUN level can occur normally in the second or third Liver disease or damage can lower your BUN level. Remove urea from the blood normally, your BUN level rises.ĭehydration, or a diet high in protein can also make Liver and passed out of your body in the urine. Urea is made when protein is broken down in your The amount of nitrogen in your blood that comes from the waste product 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).A blood urea nitrogen (BUN) test measures.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.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 non-prescription 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 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. 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. Blood urea nitrogen to creatinine ratio (BUN:creatinine)Ī BUN test may be done with a blood creatinine test. A low BUN level can occur normally in the second or third trimester of pregnancy. 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.
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