Serum analysis revealed hypophosphatemia of 1.7 ng/mL (0.5 mmol/L) (normal reference range, 3.30-5.20 mg/dL; 1.07-1.68 mmol/L); serum calcium levels were 9.7 mg/dL (2.42 mmol/L) (normal reference range, 8.8-10.7 mg/dL; 35.20-42.80 mmol/L), whereas parathyroid hormone (PTH) was slightly increased at 70.0 pg/mL (8.27 pmol/L) (normal reference range, 10.0-65.0 pg/mL; 1.06-6.9 pmol/L). Here, PTH is linked to hypophosphatemia.