Postoperative hypocalcaemia represents one of the most important complications of thyroidectomy. The main cause of hypocalcaemia is inadvertent damage to the parathyroid glands as well as incomplete knowledge of the possible embryological anomalies. Early detection of patients with suspected hypocalcaemia is important to reduce the incidence of complications and minimize hospital stay and health care expenses post operatively. Intraoperative parathyroid hormone assay is of great accuracy in early prediction of post thyroidectomy transient and permanent hypocalcaemia.