There was a positive correlation of serum cystatin C with albuminuria, a negatively correlation between serum Cystatin C level and eGFR in prediabetic subjects. There was a strong positively correlation of eGFR according to CKD EPI equation based on serum Cystatin C (r=0.804, p < 0.001) and renal radiography (r=0.767, p<0.001).