Which laboratory test is used to determine the urinary system's ability to break down nitrogenous compounds from proteins to produce urea nitrogen?

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BUN (blood urea nitrogen) is the laboratory test used to determine the urinary system's ability to break down nitrogenous compounds from proteins to produce urea nitrogen. Serum creatinine and GFR (glomerular filtration rate) are measures of kidney function but do not specifically assess the breakdown of nitrogenous compounds.

Which Laboratory Test Is Used to Determine the Urinary System's