PTH levels may be a significant predictive factor for post-operative hypoparathyroidism and hypocalcemia: among the 37 patients with PTH < 12 pg/mL who developed a temporary postoperative hypocalcemia, five patients (8%) developed a definitive hypocalcemia, while no patients with hypocalcemia and PTH levels > 12 pg/mL developed a definitive hypocalcemia. This evidence concerns the gene PTH and Hypocalcemia.