The laboratory data revealed hypophosphatemia (serum inorganic phosphate [iP]: 1.8 mg/dL), increased alkaline phosphatase (ALP [747 U/L]), and bone-specific ALP (BAP [173.9 μg/L]) with inappropriately high intact FGF23 (85 pg/mL, reference range under chronic hypophosphatemia: <30 pg/mL; Minaris Medical). This evidence concerns the gene FGF23 and hypophosphatemia.