In the 24-month follow-up, 7 (7.07%) patients had serum calcium deficiency; 11 (13.10%) ionized calcium deficiency; 20 (22.47%) high PTH; and 33 (61.11%) vitamin D insufficiency or deficiency (Table 1). The gene discussed is PTH; the disease is hyperinsulinemic hypoglycemia, familial, 4.