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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. The kidneys filter waste materials from the….
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The most common home remedies for kidney stones involve drinking different fluids, including just water, to help flush your stones out and prevent new…. Kidneys perform essential functions in your body, filtering waste and producing hormones. Read more on how to maintain good kidney health. Your kidneys filter your blood and remove toxins from your body. This can lead…. Learn about positive lifestyle changes that may improve your glomerular filtration rate GFR and slow the loss of kidney function for people with….
Health Conditions Discover Plan Connect. Type 2 Diabetes. 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? What are the risks of a BUN test? Some specialist test results may take longer, if samples have to be sent to a reference specialist laboratory.
If you are registered to use the online services of your local practice, you may be able to access your results online. Your GP practice will be able to provide specific details. If the doctor wants to see you about the result s , you will be offered an appointment. If you are concerned about your test results, you will need to arrange an appointment with your doctor so that all relevant information including age, ethnicity, health history, signs and symptoms, laboratory and other procedures radiology, endoscopy, etc.
Lab Tests Online-UK is an educational website designed to provide patients and carers with information on laboratory tests used in medical care.
We are not a laboratory and are unable to comment on an individual's health and treatment. Reference ranges are dependent on many factors, including patient age, sex, sample population, and test method, and numeric test results can have different meanings in different laboratories.
For these reasons, you will not find reference ranges for the majority of tests described on this web site. The lab report containing your test results should include the relevant reference range for your test s. Please consult your doctor or the laboratory that performed the test s to obtain the reference range if you do not have the lab report.
Urea is the final breakdown product of the amino acids found in proteins. Nitrogen in the form of ammonia is produced in the liver when protein is broken down. The nitrogen combines with other chemicals in the liver to form the waste product urea.
The urea is released into the bloodstream and carried to the kidneys where it is filtered out of the blood and excreted in the urine. Most diseases that affect the kidneys or liver can affect the amount of urea present in the blood.
If increased amounts of urea are produced by the liver or decreased amounts are removed by the kidneys then blood urea concentrations will rise. If significant liver damage or disease reduces the production of urea then urea concentrations may fall. Urea and creatinine levels are used to evaluate how well the kidney is working and to monitor patients with kidneys that are diseased or those receiving kidney dialysis.
Some symptoms and signs of kidney dysfunction include:. High urea levels suggest poor kidney function.
This may be due to acute or chronic kidney disease. However, there are many things besides kidney disease that can affect urea levels such as decreased blood flow to the kidneys as in congestive heart failure , shock, stress, recent heart attack or severe burns; bleeding from the gastrointestinal tract; conditions that cause obstruction of urine flow; or dehydration.
Low urea levels are not common and are not usually a cause for concern.
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