Analyzed correlation, Receiver operating characteristics (ROC), calculated the area under the curve (AUC) for serum Cystatin C Results: The level of serum Cystatin C gradually significantly increased in healthy subjects, prediabetes, and type 2 diabetic patients (0.848±0.097; 0.894±0.113; 1.410±0.900 mg / L, p<0.05, respectively).