Article Type

Original Study


Objectives This study was conducted to evaluate the clinical usefulness of cystatin C levels in the serum in predicting renal impairment in patients with type 2 diabetes. Background In clinical practice, the glomerular filtration rate is often estimated from plasma creatinine levels. Several studies have shown cystatin C to be a better marker for the diagnosis of impaired renal function. Materials and methods Plasma samples were obtained from 20 healthy individuals and 40 patients with diabetes mellitus type 2 for the determination of the levels of creatinine and cystatin. In addition, we classified all participants according to the urine albumin/creatinine ratio. Results Patients were categorized into the following groups depending on their urine albumin/creatinine ratio (mg/g creatinine): macroalbuminuric, microalbuminuric, and normoalbuminuric. There were no significant differences in age and sex between the three groups. However, the estimated glomerular filtration rate was significantly lower in the macroalbuminuric group compared with the microalbuminuric and normoalbuminuric groups, and cystatin C showed a highly significant difference in detecting early decline in diabetic patients. Conclusion From this study, we concluded that estimation of the serum cystatin C level is a useful, practical, and noninvasive tool for early detection of renal impairment in the course of diabetes.