PTH and Hypocalcemia: Kakava et al. (2020) used a similar method to investigate risk factors for postoperative HPT and obtained positive results. A more recent study in 2022 concluded that the ratio of the postoperative PTH at 4 h to the preoperative PTH is an excellent indicator of symptomatic hypocalcemia in the early postoperative period and would be a valuable addition for early identification of patients at high risk of hypocalcemia (Daskalaki et al., 2022).