Liver disease or damage can lower your BUN level. A low BUN level can occur normally in the second or third trimester of pregnancy. A BUN test may be done with a blood creatinine test. 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. A BUN-to-creatinine ratio can help your doctor check for problems, such as dehydration, that may cause abnormal BUN and creatinine levels.
When a blood sample is taken, you may feel nothing at all from the needle. Or you might feel a quick sting or pinch. There is very little chance of having a problem from this test. When a blood sample is taken, a small bruise may form at the site.
Each lab has a different range for what's normal. Your lab report should show the range that your lab uses for each test. The normal range is just a guide. Your doctor will also look at your results based on your age, health, and other factors. A value that isn't in the normal range may still be normal for you.
Rhoads MD - Internal Medicine. Author: Healthwise Staff. Medical Review: E. This information does not replace the advice of a doctor. Healthwise, Incorporated, disclaims any warranty or liability for your use of this information. Rodwell VW, et al. In: Harper's Illustrated Biochemistry. McGraw-Hill Education; Lab Tests Online. Blood urea nitrogen. Kidney disease adult.
Mayo Clinic; Inkler LA, et al. Assessment of kidney function. National Kidney Foundation. KDIGO clinical practice guidelines for the evaluation and management of chronic kidney disease.
Kidney International Supplements. Chebib FT expert opinion. Mayo Clinic. April 19, Related Diabetic coma. Blood urea nitrogen BUN test About. It does this by measuring the amount of urea nitrogen in the blood. Normally, the kidneys filter out this waste, and urinating removes it from the body. BUN levels tend to increase when the kidneys or liver are damaged.
Having too much urea nitrogen in the blood can be a sign of kidney or liver problems. A BUN test is a blood test most commonly used to evaluate kidney function. The test may even be used to determine the effectiveness of dialysis treatment. BUN tests are also often performed as part of regular checkups, during hospital stays, or during or after treatment for conditions like diabetes.
Certain medications can affect your BUN levels. Some medications, including chloramphenicol or streptomycin, may lower your BUN levels. Other drugs, such as certain antibiotics and diuretics, may increase your BUN levels. Your doctor will consider this information when reviewing your test results. Before drawing blood, a technician will clean an area of your upper arm with an antiseptic.
The technician will then insert a sterile needle into a vein and draw blood into a tube attached to the needle. You may feel mild to moderate pain when the needle goes in. Once they collect enough blood, the technician will remove the needle and apply a bandage over the puncture site.
Your doctor will follow up with you to discuss the test results. Normal BUN values tend to vary depending on gender and age. In general, normal BUN levels fall in the following ranges:. Depending on your test results, your doctor may also run other tests to confirm a diagnosis or recommend treatments.
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