All were within normal limits, except for some cases of high PTH levels, in which hyperparathyroidism was secondary to very low levels of vitamin D. It should be noted that the vitamin D values found in the women studied were generally very low, considered insufficient (< 30 ng/mL) and even close to deficiency (values < 20 ng/mL). This evidence concerns the gene PTH and hyperinsulinemic hypoglycemia, familial, 4.