Quick Answer. A blood urea nitrogen, or BUN, test is used to gauge the amount of nitrogen in the blood of a person. It also helps to understand how well the liver and kidneys are functioning, as stated by the Mayo Clinic. Continue Reading.
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A common blood test, the blood urea nitrogen (BUN) test reveals important information about how well your kidneys and liver are working. A BUN test measures the amount of urea nitrogen that's in your blood. Here's how your body typically forms and gets rid of urea nitrogen: Your liver produces ammonia — which contains nitrogen — after it breaks down proteins used by your body's cells.
http://www.mayoclinic.org/tests-procedures/blood-urea-nitrogen/home/ovc-20211239
The liver produces urea in the urea cycle as a waste product of the digestion of protein. Normal human adult blood should contain between 6 and 20 mg of urea nitrogen per 100 ml (6–20 mg/dL) of blood. Individual laboratories will have different reference ranges as the assay used will vary between laboratories.
https://en.wikipedia.org/wiki/Blood_urea_nitrogen
Occasionally, a health practitioner will look at the ratio between a person's BUN and blood creatinine to help determine what is causing these concentrations to be higher than normal. The ratio of BUN to creatinine is usually between 10:1 and 20:1.
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The Test. How is it used? The blood urea nitrogen or BUN test is primarily used, along with the creatinine test, to evaluate kidney function in a wide range of circumstances, to help diagnose kidney disease, and to monitor people with acute or chronic kidney dysfunction or failure.
https://labtestsonline.org/understanding/analytes/bun/tab/test
Reference ranges for blood tests, comparing urea (yellow at right) to other blood constituents. Another rare cause of a decreased BUN is ornithine transcarbamylase deficiency, which is a genetic disorder inherited in an X-linked recessive pattern. OTC Deficiency is also accompanied by hyperammonemia and high orotic acid levels.
https://en.wikipedia.org/wiki/Blood_urea_nitrogen
BUN (blood urea nitrogen) is a blood test to check kidney function. So is the serum creatinine test. When your doctor talks about BUN/creatinine levels or a BUN-to-creatinine ratio, he or she is referring to the two main blood tests that tell how well the kidneys are filtering waste products from your blood. The ratio of BUN to creatinine is normally in the range of 10:1 to 20:1.
http://www.lifescript.com/health/briefs/w/what_are_bun_creatinine_levels.aspx
BUN and creatinine are the primary tests used to check how well the kidneys are able to filter waste products from your blood. Your healthcare provider may also order a renal panel or electrolyte tests, such as sodium and potassium, or calcium to help understand how your kidneys are functioning. ^ Back to top.
https://labtestsonline.org/understanding/analytes/bun/tab/faq
Clinical Significance. The BUN/Creatinine ratio is useful in the differential diagnosis of acute or chronic renal disease. Reduced renal perfusion, e.g., congestive heart failure, or recent onset of urinary tract obstruction will result in an increase in BUN/Creatinine ratio.
http://www.questdiagnostics.com/testcenter/TestDetail.action?ntc=296
Increased urea formation also results in an increase in the ratio, e.g., gastrointestinal bleeding, trauma, etc. When there is decreased formation of urea as seen in liver disease, there is a decrease in the BUN/Creatinine ratio. In most cases of chronic renal disease the ratio remains relatively normal.
http://www.questdiagnostics.com/testcenter/TestDetail.action?ntc=296
what is bun on a blood test
The Blood Urea Nitrogen test, a blood test that is used to know how well the kidneys are filtering waste products from your blood.