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Evaluation of glomerular filtration rate is of crucial importance in diabetes. Cystatin C, a cysteine protease inhibitor seems to be an interesting parameter.67 diabetic patients with normal creatinine are evaluated. Cystatin C is compared to renal markers, by reference to Cr EDTA clearance.Significant correlations are found between cystatin C and creatinine (r=0.54). GFR MDRD (r=−0.47) and GFR Cr...