Receiver operating characteristic curve for predictability of pre-ECMO lactate level for survival to hospital discharge. The area under the receiver operating characteristic curve was 0.929 (95% confidence interval: 0.840 to 1.000, P = 0.001) for pre-ECMO lactate level. The optimal cut off value of pre-ECMO lactate level was 10.5 mmol/L for predicting survival at hospital discharge. In analysis of pre-ECMO lactate level 10.5 mmol/L, sensitivity of 85.7%, specificity of 86.7%, positive predictive value of 93.8%, and negative predictive value of 60.0% were noted. Abbreviation: ECMO, extracorporeal membrane oxygenation.