Previously, Edafe et al. proved that higher preoperative PTH was not a risk factor of hypocalcemia in a systematic review (Edafe et al., 2014), while Al-Dhahri et al. (2014) found that patients’ BMI and preoperative PTH level may affect the speed of recovery of hypoparathyroidism. The gene discussed is PTH; the disease is Hypocalcemia.