ALB and acute kidney injury: Univariate (Additional file 1: Table S5) and crude multivariate (Table 4) logistic regression analysis showed that presence of tumors, higher serum albumin, and AKI stage 1 were associated with failure to timely diagnose AKI, while presence of CKD, presence of oliguria, higher blood urea nitrogen, and greater number of organ failures correlated with timely diagnosis.