The Value of Glycated haemoglobin A1c for the diagnosis of type 2 diabetes compared with fasting plasma glucose

Objective: To evaluate the role of HbA1c in T2DM diagnosis.Methods:251 patients were underwent oral glucose tolerance test(OGTT) and HbA1c measurement.The receiver operating characteristic(ROC) curve was drawing.Results:The optimal cut-point of ROC curve of HbA1c is 7.05%,with sensitivity of 91.1%,specificity of 92.8%,area under the curve(AUC) of 0.971.However,the optimal cut-point of ROC curve of FPG was 6.94mmol/L,with sensitivity of 81%,specificity of 100%,area under the curve(AUC) of 0.944.Conclusion:Compared with FPG(cut-point: 6.94 mmol/L),HbA1c(cut-point: 7.05%) has higher sensitivity but lower specificity.