PTH and Hypocalcemia: Low levels of parathyroid hormone (PTH) after surgery and the resulting hypocalcemia may be associated with damage to the parathyroid glands due to an accidental removal of one or more glands or a compromised blood supply due to their dissection [25,26], and this risk may be even higher in patients who are subjected to total thyroidectomy and central neck dissection [25,27,28,29,30].