TIMP2 and acute kidney injury: Acute kidney injury was identified according to the KDIGO consensus criteria, resulting in patient categorization into four groups: (1) [TIMP-2]•[IGFBP7] (-)/AKI (-), (2) [TIMP-2]•[IGFBP7] (+)/AKI (-), (3) [TIMP-2]•[IGFBP7] (-)/AKI (+), and (4) [TIMP-2]•[IGFBP7] (+)/AKI (+).