Cockcroft Gault formula
A formula to estimate creatinine clearance based on the age of the patient and the weight:
Creatinine Clearance = (140 - age) x lean body weight (in kg.)
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Plasma creatinine (mg/dl) x 72
This formula provides an estimate of creatinine clearance ( and thus an overestimate of GFR). It is, however, useful clinically to approximate GFR.
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