Interpretation Provides information to assist in interpretation of the test results. Serum blood urea nitrogen (BUN) determinations are considerably less sensitive than BUN clearance (and creatinine clearance) tests, and levels may not be abnormal until the BUN clearance has diminished to less than 50%.
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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.
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Blood urea nitrogen (BUN) testing is commonly part of the basic metabolic panel (BMP) or comprehensive metabolic panel (CMP), which is commonly obtained as part of a routine medical examination. It is also obtained in patients in emergency or urgent care settings, as it can provide valuable information that may provide clues to various clinic...
https://emedicine.medscape.com/article/2073979-overview
A BUN, or Blood Urea Nitrogen test, measures the level of urea nitrogen in the blood using a standard blood sample. Urea nitrogen is the natural byproduct of the breakdown of protein. According to the American Association for Clinical Chemistry, BUN tests are mainly used to assess kidney health.
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BUN levels increase with age. BUN levels in very young babies are about 2/3 of the levels found in healthy young adults, while levels in adults over 60 years of age are slightly higher than younger adults. What is a BUN/Creatinine ratio?
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BUN : Urea is the final degradation product of protein and amino acid metabolism. In protein catabolism, the proteins are broken down to amino acids and deaminated. The ammonia formed in this process is synthesized to urea in the liver. This is the most important catabolic pathway for eliminating excess nitrogen in the human body.
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The determination of serum BUN currently is the most widely used screening test for the evaluation of kidney function. The test is frequently requested along with the serum creatinine test since simultaneous determination of these 2 compounds appears to aid in the differential diagnosis of prerenal, renal and postrenal hyperuremia.
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A BUN test uses a blood sample to check blood urea nitrogen levels. As the waste product of protein digestion, the liver and kidneys influence blood urea nitrogen levels heavily. Urea is released by the liver into the blood and sent to the kidneys to be removed in the urine.
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This results in a disproportionate rise in BUN levels relative to any change in serum creatinine levels. This elevation in the BUN-to-creatinine ratio is one of the laboratory indicators of decreased renal perfusion.
https://emedicine.medscape.com/article/2073979-overview
A rise or fall in blood urea nitrogen levels may indicate a wide range of health problems. This is because the kidneys and liver are involved in a wide range of body functions. According to the Medical Council of Canada, normal blood urea nitrogen levels range between 7 and 22 milligrams per deciliter. A result higher than 50 milligrams per deciliter is likely to signal an underlying health problem. Elevated BUN levels can result from:
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what is bun levels
A BUN, or Blood Urea Nitrogen test, measures the level of urea nitrogen in the blood using a standard blood sample.