['The purpose of this study was to compare prenatal versus postnatal markers of congenital diaphragmatic hernia (CDH) severity at a single fetal-care center.', 'A retrospective study was performed of patients having a complete prenatal evaluation and surgical repair (n\u2009=\u200955). Observed-to-expected lung-to-head ratio (o/eLHR), observed-to-expected total lung volume (o/eTLV), liver position (LP), a predictive dependent variable from logistic regression of o/eLHR and liver position (o/eLHR\u2009+\u2009LP), and diaphragmatic defect size per the CDH Study Group A-D classification were plotted into receiver-operating characteristics (ROC) curves. Survival and need for extracorporeal membrane oxygenation (ECMO) were primary outcomes.', 'Survival was 69%, and ECMO utilization was 56%. Distribution was 80% left-sided defects. In the survival ROC curve, the area under the curve (AUC) for o/eLHR was 0.73, o/eTLV 0.74, LP 0.73, o/eLHR\u2009+\u2009LP 0.78, and defect size 0.84 (p\u2009=\u20090.23). The ROC curve for ECMO support showed o/eLHR had an AUC of 0.82, o/eTLV 0.89, LP 0.79, o/eLHR\u2009+\u2009LP 0.87, and defect size 0.90 (p\u2009=\u20090.19). The AUCs were similar when only left-sided CDH was analyzed.'] Do prenatal and postnatal markers of severity in congenital diaphragmatic hernia have similar prognostic ability?