LCN2 and acute kidney injury: Key features are the variation in profiles between patients for all biomarkers, the greater dynamic range (fold-differences) for some biomarkers compared to others, and the greater separation at time points after ED admission (6 to 24 h) between most AKI and non-AKI patients for urinary NGAL, and to a lesser extent plasma NGAL and plasma CysC, compared with other biomarkers.