The purpose of the present study is to evaluate bias, precision and accuracy of new cystatin C and creatinine based equations for GFR estimation compared with 51Cr-EDTA measured GFR in patients with diabetes.~Additional, we will check which equation detects better the reduction of renal function over the time, in patients with diabetes.~Finally, we will investigate if cystatin C levels can be influenced by factors other than GFR
The purpose of the present study is to evaluate bias, precision and accuracy of new cystatin C and creatinine based equations for GFR estimation compared with 51Cr-EDTA (chromium-51 labeled ethylenediamine tetraacetic acid) measured GFR in patients with diabetes.