Vitamin D deficiency (25(OH)D < 25 nmol/L): All 46% (20–73%)Secondary hyperparathyroidism (s-PTH > 7.6 pmol/L): All 16% (–0.4 –30%)Level of 25(OH)D2 + 3:–13.7 nmol/L. The gene discussed is PTH; the disease is secondary hyperparathyroidism.