Bennett MR, et al. - In a study sample of children undergoing cardiopulmonary bypass surgery (CPB), researchers observed greatly increased risk of developing acute kidney injury (AKI) post-CPB among children with lowest preoperative levels of urinary uromodulin (uUMOD). If uUMOD were used to risk-stratify patients undergoing CPB, clinical measures could be taken to minimize AKI development.