LCN2 and acute kidney injury: NGAL does not significantly predict AKI (OR: 1.0, 95 % CI: 0.93–1.10, p = 0.394), while TIMP-2 x IGFBP-7 shows a borderline association (OR: 1.09, 95 % CI: 1.00–1.10, p = 0.143).