How do I calculate residual renal function?

How do I calculate residual renal function?
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This paper states ” the standard method of quantifying residual renal function is by 24 h urine collection, calculating GFR as the mean of urea and creatinine clearance and normalizing to 1.73 m2 surface area. This method has been the most well studied in advanced renal failure both before starting dialysis and after starting CAPD [22]. ”
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