PTH and hypoparathyroidism: Clinical hypoparathyroidism is defined as biochemical hypoparathyroidism with symptoms and/or signs of hypocalcemia present.5Although most hypocalcemia is transient, its occurrence is significant because it leads to prolonged hospitalization, can cause uncomfortable symptoms in patients, reducing their quality of life, and may lead to life-threatening conditions in rare instances.6Serum and ionized calcium concentrations, and more recently PTH concentrations, are standardly used to monitor postoperative hypocalcemia.