The median (IQR) PTH was significantly different, dependent on vitamin D status (severe deficiency 7.37 (5.44–10.55) pmol/L; deficiency 5.63 (4.13–7.40) pmol/L; insufficiency 5.14 (3.87–6.99) pmol/L; sufficiency 4.31 (3.75–5.73) pmol/L; p<0.001). The gene discussed is PTH; the disease is hyperinsulinemic hypoglycemia, familial, 4.