Laboratory investigations revealed hypophosphatemia with serum phosphate levels ranging from 0.30 to 0.46 mmol/L (normal range, 0.85- 1.51 mmol/L), elevated ALP levels ranging from 366 to 463 U/L (normal range, 30- 120 U/L), FGF-23 at 17.56 pg/ml (normal range, 23.3- 95.4 pg/ml) and total procollagen type 1 amino-terminal propeptide (tP1NP) at 92.37 ng/ml (normal range, 15.1- 58.6 ng/ml). This evidence concerns the gene FGF23 and hypophosphatemia.