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Updated visitor guidelines. Top of the page. Test Overview A blood urea nitrogen BUN test measures the amount of nitrogen in your blood that comes from the waste product urea. See if your kidney disease is getting worse. See if treatment of your kidney disease is working. Check for severe dehydration.
Dehydration generally causes BUN levels to rise more than creatinine levels. This causes a high BUN-to-creatinine ratio. Kidney disease or blockage of the flow of urine from your kidney causes both BUN and creatinine levels to go up. How It Is Done A health professional uses a needle to take a blood sample, usually from the arm. How It Feels When a blood sample is taken, you may feel nothing at all from the needle.
Risks There is very little chance of having a problem from this test. Results Normal Each lab has a different range for what's normal. High values A high BUN value can mean kidney injury or disease is present. A better measure is the ratio of BUN to creatinine found in your blood. Typically, the ratio of BUN to creatinine should be between and If it's lower or higher than that, it may mean you have a problem with your kidneys or you may not be drinking enough water.
The test is done with a blood sample. A needle is used to draw blood from a vein in your arm or hand. Having a blood test with a needle carries some risks. These include bleeding, infection, bruising, and feeling lightheaded. When the needle pricks your arm or hand, you may feel a slight sting or pain. Afterward, the site may be sore.
Your BUN levels might rise even if your kidneys are working as they should for many reasons. These include:. This is why the ratio of BUN levels to creatinine levels is a more reliable measure of kidney health.
You don't need to prepare for this test. Be sure your healthcare provider knows about all medicines, herbs, vitamins, and supplements you are taking. Search Encyclopedia. Kidney function tests are simple blood and urine tests that can help identify problems with your kidneys.
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Health Conditions Discover Plan Connect. Medically reviewed by Carissa Stephens, R. Why is a BUN test done? How do I prepare for a BUN test? How is a BUN test performed? What do the results of a BUN test mean?
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