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Percentage change in serum FGF23 as determined by the C-terminal (a) and Intact (b) Immutopics assays in pediatric dialysis patients treated for 8 months with 1αD2+CaCO3 (closed diamonds), 1αD2+sevelamer (open diamonds), calcitriol+CaCO3 (closed squares), and calcitriol+sevelamer (open squares). Asterisk indicates p<0.01 from baseline. 1αD2, doxercalciferol; CaCO3, calcium carbonate.
