FGF23 and chronic kidney disease: This is consistent with the study done by Worung et al. [1], which revealed a low significantly positive correlation between FGF23 and iPTH in predialysis CKD (r=0.168, p=0.046), and a study by Hussain et al. [21], which also found a positive correlation between FGF23 and iPTH in hemodialysis patients (r=0.223, p=0.119).