endogenous creatinine clearance

en·dog·e·nous cre·at·i·nine clear·ance

a term distinguishing measurements based on the creatinine normally present in plasma; given that no infusion is necessary, an average value may be obtained by collecting urine for a long period, for example, 24 hours.
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The twenty-four hourly endogenous creatinine clearance as a clinical measure of the functional state of the kidneys.