A blood urea nitrogen test is generally a safe procedure, with no potential risks, it only involves a taking a sample of blood from a vein in your arm.
4 Preparing for your Procedure
Required preparation for your blood urea nitrogen (BUN) test includes:
If your blood sample is being tested only for blood urea nitrogen, you can eat and drink a normally as you do.
If you blood sample will be used for additional testing, you may be required to fast for a certain amount of time before the test. You will be given specific instructions by your doctor.
5 What to Expect
Here’s what you can expect during and after your blood urea nitrogen (BUN) test.
During the blood urea nitrogen test, a member of your health care team will take a sample of your blood by inserting a needle into a vein located in your arm.
The blood sample is then sent to the lab for analysis. After the blood sample has been taken, you will be told to resume your daily routine activities.
6 Procedure Results
Results of the blood urea nitrogen test are measured in milligrams per deciliter (mg/dL) in the United States and millimoles per liter (mmol/L) internationally.
Generally, 7 to 20 mg/Dl (2.5 to 7.1 mmol/L) is considered to be normal. However, normal range may vary, depending on the reference range utilized by the lab and your age.
Ask your doctor to explain your results. The tendency of urea nitrogen levels to rise increases with age. Generally, a high blood urea nitrogen level means you kidneys are not functioning as well as they are supposed to.
But elevated urea nitrogen can also be due to the following:
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