CST3 and acute kidney injury: Cystatin C levels had moderate ability to discriminate between children with or without AKI in malaria with an area under the receiver operator characteristic curve (AUC) of 0.71 (95% CI 0.64 to 0.77) and good discriminatory ability in children with NMFI with an AUC of 0.82 (95% CI 0.72 to 0.91).