PTH and hyperparathyroidism: At the time of DXA, 22 patients (62.9%) had mild persisting hyperparathyroidism (mean serum ionized calcium 1.38 ± 0.06 mmol/L), 7 patients (20.0%) suffered from postoperative hypoparathyroidism (mean serum ionized calcium 1.12 ± 0.06 mmol/L), and 6 patients (17.1%) had normal parathyroid hormone function (ie, normocalcemia without calcium or alfacalcidol supplements).