Which of the following tests is a measure of muscle breakdown and filtration capacity of the nephron?

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The serum creatinine level is a measure of muscle breakdown and filtration capacity of the nephron.The creatinine concentration is proportional to the glomerular filtration and tubular excretion rates,and this ratio commonly is used as the index of creatinine clearance in a 24-hour urine collection.BUN is a commonly used indicator of kidney function,but the BUN level is not as specific as creatinine clearance or serum creatinine level.

Which of the Following Tests Is a Measure of Muscle