The level of 25-hydroxy-vitamin D (25-OH D) was 7.5 ng/mL (<20 ng/mL is defined as deficiency), and parathyroid hormone (PTH) was 560 pg/mL (reference range: 160–520 pg/mL), indicating osteomalacia. This evidence concerns the gene PTH and hyperinsulinemic hypoglycemia, familial, 4.