Background Acute kidney injury (AKI) complicates most cardiac surgery patients. This study assessed the accuracy of urine neutrophil gelatinase-associated lipocalin (uNGAL) and Renal Resistive Index (RRI) to early predict (AKI) after cardiopulmonary bypass (CPB). Methods This work enrolled 57 cases of elective cardiac surgery with CPB. https://www.markymarkscott.com/product-category/specialty-color-products/