As the early detection of AKI is essential for improving treatment outcomes, biomarker candidates for AKI have been proposed, and these include cystatin C, kidney injury molecule-1, neutrophil gelatinase-associated lipocalin (NGAL), tissue inhibitor of metalloproteinase-2, and insulin-like growth factor (IGF)-binding protein-7 [13]. Here, IGFBP7 is linked to acute kidney injury.