Receiver operating curves(ROC) revealed of all markers the area under the curve(AUC) for Cys C was found be greatest in the condition of renal dysfunction was defined as GFR less than 60 ml/min(AUC=0.964) or less than 80 ml/min(AUC=0.921).

• ROC曲线表明；无论以GFR<60 ml/min；还是以GFR<80 ml/min定义为肾功能不全；Cys C对诊断CABG术后急性肾功能不全的准确性均高于SCr、CG公式。