AQP2 abundance using specific AQP2 antibody 19-65-1 was significantly higher in kidney transplant recipients with acute kidney injury (median 0.17; IQR 0.09 to 0.24) compared to immediate allograft function (median 0.09; IQR 0.06 to 0.15; p < 0.05 by Mann–Whitney test). This evidence concerns the gene AQP2 and acute kidney injury.