PTH and Hypocalcemia: All patients who developed a definitive hypocalcemia had a 1-day postoperative PTH level < 1 pg/mL, and a postoperative PTH level < 5 pg/mL was a strong predictive factor for definitive hypoparathyroidism (OR = 24.5 (95% CI 2.83–212.51, p < 0.0001).