One study stated that combined measurement of intact PTH levels (<15 pg/mL) on postoperative day 1 and serum calcium levels (<1.9 mmol/L) on postoperative day 2 had a remarkable performance (sensitivity, 96.3%; specificity, 96.1%; PPV, 86.0%; and NPV, 99.0%) in determining postthyroidectomy hypocalcemia [5]. The gene discussed is PTH; the disease is Hypocalcemia.