Pre-PTX, she had a PTH value of 1389.6 pg/mL, but serum corrected calcium was only 7.3 mg/dL. Her postoperative course was complicated by worsening hypocalcemia, a prolonged need for intravenous calcium infusion after PTX consistent with hungry bone syndrome, and ongoing hyperphosphatemia with phosphorus persistently ranging from 6 to 8 mg/dL. The gene discussed is PTH; the disease is Hypocalcemia.