The EUROCRINE registry collects data on preoperative serum PTH levels (defined as low, normal, high, or not measured), use of parathyroid autotransplantation, number of parathyroid glands identified, use of autofluorescence to identify the parathyroid glands, use of calcium during admission (defined as preoperative medication for a reason other than hypoparathyroidism or routine protocol of the clinic irrespective of calcium/PTH values or treatment due to hypoparathyroidism), use of vitamin D on discharge from hospital, and postoperative PTH serum levels (low, normal, high, or not measured). The gene discussed is PTH; the disease is hypoparathyroidism.