FGF23 and hypophosphatemia: However, there are other less common forms of hereditary FGF23-dependent hypophosphatemia, such as autosomal dominant hypophosphatemic rickets (ADHR) and recessive (autosomal-recessive hypophosphatemic rickets, ARHR), polyostotic fibrous dysplasia, hypophosphatemic rickets with hyperparathyroidism and non-lethal Raine syndrome [1].