Bland-Altman plots of predicted and measured serum creatinine in internal test dataset, temporal validation dataset, and prospective for both all days and unstable days. Unstable days were defined as those in which there was a change of 30% or 0.3 mg/dL or more in SCr concentration between the reference SCr and the measured SCr on the following patient day. Abbreviations: SCr = serum creatinine; SD = standard deviation.