PTH and leucine-induced hypoglycemia: Two of these patients with serum calcium levels of 2.71 and 2.65 mmol/l and elevated PTH levels of 17.2 and 53.6 pmol/l, respectively (reference value 1.3 to 9.3 pmol/l), underwent minimally invasive parathyroidectomy after preoperative work-up confirmed the diagnosis of LIH.