Our study showed in those who subsequently developed AKI the best AUC-ROC observed at a cut-off value of 204 ng/mL after 2 hour post transplantation, this is in agreement with results obtained by Devarjan et al. (8) and Haase et al. (21) who revealed urine NGAL within 2–6 h after cardiac surgery may predict AKI with a AUC-ROC more than 0.9 and 0.78 respectively. The gene discussed is LCN2; the disease is acute kidney injury.