A calcium concentration < 8.0 mg/dL (<2.0 mM) associated with frankly low or inappropriately normal PTH values (<15 ng/L) are the diagnostic criteria of postoperative hypoPTH [71], that the panel has considered valid also in haemoglobinopathies, since both the toxic effect of iron and the postoperative devascularization of the glands left in situ induce a permanent functional damage to parathyroids. Here, PTH is linked to hemoglobinopathy.