PTH and hypoparathyroidism: On POD1, 62 out of 135 DTC patients (45.93%) developed hypoparathyroidism, with an average PTH level of 20.86 ± 16.05 pg/mL, an average serum calcium level of 1.99 ± 0.15 mmol/L, and an average serum phosphorus level of 1.5 ± 0.31 mmol/L.