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BUN is an acronym for blood urea nitrogen. BUN is a breakdown product of amino acids which is cleared by the kidneys. Thus, it is used as one measure of kidney function, as well as assessing the status of hydration in the body, among other things. For a more direct measure of kidney function, serum creatinine and GFR (glomerular filtration rate) are used.

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Q: What component is BUN?
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