If your blood sample is being tested only for BUN , you can eat and drink normally before the test. If your blood sample will be used for additional tests, you may need to fast for a certain amount of time before the test. Your doctor will give you specific instructions. During the BUN test, a member of your health care team takes a sample of blood by inserting a needle into a vein in your arm.
The blood sample is sent to a lab for analysis. You can return to your usual activities immediately. But normal ranges may vary, depending on the reference range used by the lab and your age.
Ask your doctor to explain your results. Urea nitrogen levels tend to increase with age. Infants have lower levels than other people do, and the range in children varies.
Generally, a high BUN level means your kidneys aren't working well. But elevated BUN can also be due to:. If kidney damage is a concern, ask your doctor what factors may be contributing to the damage and what steps you can take to try to control them. In addition, your BUN levels may be checked if you are experiencing symptoms of later stage kidney disease, such as:. A health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial.
You may feel a little sting when the needle goes in or out. This usually takes less than five minutes.
You don't need any special preparations for a BUN test. If your health care provider has also ordered other blood tests, you may need to fast not eat or drink for several hours before the test. Your health care provider will let you know if there are any special instructions to follow.
There is very little risk to having a blood test. You may have slight pain or bruising at the spot where the needle was put in, but most symptoms go away quickly. Normal BUN levels can vary, but generally a high level of blood urea nitrogen is a sign that your kidneys are not working correctly. However, abnormal results don't always indicate that you have a medical condition needing treatment. A BUN test is a quick and simple blood test commonly used to evaluate kidney function.
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Read more on how to maintain good kidney health. Your kidneys filter your blood and remove toxins from your body. This can lead…. Less serious health issues that lead to abnormal BUN levels might require less intense therapy and long-term monitoring. People with more severe conditions, such as end-stage kidney disease, often need intensive and on-going treatment, such as dialysis. In the case of abnormal BUN levels caused by eating too much protein, people can limit the amount of protein-rich foods, such as meat, fish, beans, and dairy, and increase the amount of fruit and vegetables they consume.
Staying well-hydrated also helps prevent the buildup of BUN. According to a cross-sectional study, a person with high BUN levels is more likely to have high blood pressure.
A survey of over 1 million military veterans from the U. BUN tests are easy to perform and may be a useful indicator of overall health and kidney and liver function.
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In some cases…. What are BUN levels and what do they measure? Medically reviewed by Stacy Sampson, D. Measurement Preparation Procedure Results Considerations Follow-up treatments and tests A BUN test measures the level of urea nitrogen in the blood using a standard blood sample.
Share on Pinterest BUN levels can provide an update on kidney and liver health. Follow-up treatments and tests.
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