NGAL (neutrophil gelatinase-associated lipocalin), KIM-1 (kidney injury molecule 1), TIMP-2 (tissue inhibitor of metalloproteinase 2), IGFBP7 (insulin-like growth factor-binding protein 7) and cystatin C are some of the most studied AKI biomarkers [75]. Here, IGFBP7 is linked to acute kidney injury.