Laboratory analyses revealed hypophosphatemia with serum phosphate levels ranging from 0.38 to 0.55 mmol/L (normal range, 0.85- 1.51 mmol/L), elevated ALP levels ranging from 166 to 206 U/L (normal range, 30- 120 U/L), elevated PTH levels ranging from 115.0 to 244.0 pg/mL (normal range, 15- 65 pg/mL), with a positive syphilis antibody. Here, PTH is linked to syphilis.