The serum NGAL levels can rise within 2 h after AKI and has been demonstrated to be highly correlated with the subsequent increased Scr levels.[23] In addition, its prognostic role for adverse cardiovascular events is also of great value.[24] But, to date, we haven’t found any data on the role of Ang-2 in CIN after PCI. Here, LCN2 is linked to acute kidney injury.