LCN2 and acute kidney injury: Gustavo et al. (31) investigated the capability of urinary kidney stress biomarkers (UKSB), including neutrophil gelatinase-associated lipocalin (NGAL) and tissue inhibitor of metalloproteinases-2 (TIMP-2) multiplied by insulin-like growth factor binding protein 7 (IGFBP7), for the early detection of AKI in 51 critically ill COVID-19 patients.