Recently, recovery from AKI after CA has been observed in a significant proportion of these patients and can be a strong predictor of a good outcome.[29,30] Moreover, Park et al reported that the duration of AKI after CA was 1 day in their group that recovered from AKI.[2] Given that the best improvement of sensitivity obtained using a combination of 2 biomarkers was observed at 24 hours after ROSC, we suggest that NGAL can have significant prognostic performance in terms of predicting a poor neurological outcome at 24 hours after ROSC in patients with OHCA. Here, LCN2 is linked to acute kidney injury.