PTH and Hypercalcemia: Preoperative hypercalcemia (>11 mg/dL) independently increased reintervention risk (OR 4.16, 95% CI 1.17–14.79, p = 0.028), as did the identification of two or fewer enlarged glands on preoperative imaging (OR 3.12, 95% CI 1.28–7.62, p = 0.012) and elevated preoperative PTH levels above 2000 pg/mL (OR 2.83, 95% CI 1.15–6.96, p = 0.024).