FGF23 and autosomal dominant hypophosphatemic rickets: The marked increase in FGF23 during CKD goes beyond phosphate, as it was demonstrated in a mouse model of autosomal dominant hypophosphatemic rickets (ADHR) that iFGF23 was elevated during iron‐deficiency anemia in the genetic background of an Fgf23 stabilizing mutation (Farrow et al., 2011).