What is Blood Urea Nitrogen (BUN)? | Biology Definitions

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A medical test called blood urea nitrogen (BUN) quantifies the level of urea nitrogen in the blood. As a byproduct of protein digestion, urea is produced by the liver in the urea cycle. Urea nitrogen concentrations in adult human blood should range from 6 to 20 mg/dL (2.1 to 7.1 mmol/L). Since the assays utilized might change between laboratories, each will have a unique set of reference ranges. The examination is done to identify kidney issues. It is not seen to be as trustworthy as blood tests for creatinine or the BUN/creatinine ratio.

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