Laboratory studies performed during the emergency room visit identified hypercalcemia (13.1 mg/dL; normal range 8.9–10.7) and hypophosphatemia (2 mg/dL; normal range 3.0–5.2), with a concomitant intact PTH of 154 pg/mL (normal range 9–69). The gene discussed is PTH; the disease is hypophosphatemia.