What is a BUN (Blood Urea Nitrogen) Test?
A BUN, or blood urea nitrogen test, can provide important information about your kidney function. The main job of your kidneys is to remove waste and extra fluid from your body. If you have kidney disease, this waste material can build up in your blood. Over time, this may lead to serious health problems, including high blood pressure, anemia, and heart disease.
The BUN test measures the amount of urea nitrogen in your blood. Urea nitrogen is a waste product that your kidneys remove from your blood. Higher than normal BUN levels may be a sign that your kidneys aren’t working well.
People with early kidney disease may not have any symptoms. A BUN test can help uncover kidney problems at an early stage when treatment can be more effective.
Other names for a BUN test: Urea nitrogen test, serum BUN
What is BUN test used for?
A BUN test is often part of a series of tests called a comprehensive metabolic panel. It can help diagnose or monitor a kidney disease or disorder.
Why do I need a BUN test?
Your health care provider may order a BUN test as part of a routine check-up or if you have or are at risk for a kidney problem. Early kidney disease usually does not have any signs or symptoms. You may be more likely to develop kidney disease if you have:
- Family of kidney problems
- Diabetes
- High blood pressure
- Heart disease
Your provider may check your BUN levels if you are having symptoms of later stage kidney disease, such as:
- Needing to urinate (pee) more often or less often than usual
- Itching
- Fatigue
- Swelling in your legs, feet, or ankles
- Muscle cramps
- Trouble sleeping
What happens during a BUN test?
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.
Usually there is no special preparation necessary for a BUN test. But if your provider has ordered other tests on your blood sample, 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.
What do BUN test results mean?
Normal BUN levels can vary, but generally a high level of blood urea nitrogen is a sign that your kidneys are not working well. But abnormal results don’t always mean that you have a medical condition that needs treatment.
Higher than normal BUN levels can also be caused by dehydration (too little fluid in your body), burns, certain medicines, a high protein diet, or other factors, including your age. BUN levels normally increase as you get older. To learn what your results mean, talk to your health care provider.
A BUN test is only one type of measurement of kidney function. If your health care provider thinks you may have kidney disease, you may need other tests. These may include tests to measure:
- Creatinine, which is another waste product that your kidneys remove from your body
- GFR (Glomerular Filtration Rate), which estimates how well your kidneys are filtering blood
Disclaimer
Please seek professional help regarding any health conditions or concerns. This article is for information purposes only and should not be considered a substitute for medical expertise. These are opinions from a panel of individual experts and are not to be considered opinions of Medikstar.