FGF23 and hyperphosphatemia: The time to development of hyperphosphatemia in dogs with CKD having FGF‐23 concentrations >528 pg/mL (median time, 175 days; 95% confidence interval [CI], 0‐395 days) was significantly shorter than that of dogs with FGF‐23 concentrations ≤528 pg/mL (median time was not reached during the study period, P < .001; Figure 1).