CST3 and diabetes mellitus: Furthermore, Murty et al. found that cystatin C is superior over creatinine for GFR estimation in early kidney injury stages, especially in the so-called creatinine blind GFR area (40–70 mL/min/1.73 m2) [32], though this study was performed on an adult cohort, the findings could substantiate our results where we found that using cystatin C could help to capture young diabetes patients in early kidney injury phase when GFR is between 60 and 89 mL/min/1.73 m2.