The sensitivity and specificity of urine NGAL for predicting AKI were 0.83 (95% CI: 0.78–0.87) and 0.81 (95% CI: 0.77–0.85), respectively, and SROC was 0.89 (95% CI: 0.86–0.91). The gene discussed is LCN2; the disease is acute kidney injury.