At day 1 after OLT, serum NGAL concentrations increased to 49 ng/ml, IQR 33–67 in the no/mild AKI group (P = 0.005) and to 73 ng/ml, IQR 44–107 in the severe AKI group (P<0.001), but did not differ among groups (P = 0.73). Here, LCN2 is linked to acute kidney injury.