This corroborates the results of a recent study which demonstrated that perioperative decline did not add much value to the diagnosis of PoSH compared with a single value of PTH measured 2h after thyroidectomy.26 In another study of 349 patients undergoing total thyroidectomy, a 70% decline in PTH at 1h after surgery had a sensitivity and specificity of predicting hypocalcaemia of 84.1% and 95%, respectively. Here, PTH is linked to Hypocalcemia.