What test of kidney function measures the rate at which nitrogenous waste is removed from the blood by comparing its concentration in the blood and urine over a 24-hour period?

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The creatinine clearance test measures the rate at which nitrogenous waste is removed from the blood by comparing the concentration of creatinine in the blood and urine over a 24-hour period. BUN measures the amount of urea nitrogen in the blood, but does not provide information about the rate at which nitrogenous waste is removed. CAPD (continuous ambulatory peritoneal dialysis) and ESWL (extracorporeal shockwave lithotripsy) are medical procedures used to treat kidney disorders, but do not measure kidney function.

What Test of Kidney Function Measures the Rate at Which