In patients with transient hypocalcemia, the postoperative day 1 serum PTH and Ca levels were significantly reduced (PTH from 51.89 to 10.30 pg/ml (80.15% reduction)) and Ca was decreased from 2.34 to 1.88 mmol/l (19.51%, reduction; p < 0.01; Figures 1(c) and 1(d)). Here, PTH is linked to Hypocalcemia.