These authors compared equations involving age, weight, gender, race and SCr to calculate GFR vs actual GFR measurements with iothalamate in patients who undergo renal surgery. They conclude that the CKD-EPI GFR estimation is most accurate to calculate GFR in such cases. Although this is technically correct, clinically there is not much difference among the equations. The authors noted that 20%, 21%, 22% and 25% of cases were misclassified using CKD-EPI, reMDRD, MDRD and CG, respectively, which in my opinion is not much different. Looking at the correlation between iGFR and calculated GFR for the various equations, correlation coefficients are relatively poor.
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