An alternative marker is PTH due to its short half-life (t1/2) of only 3 minutes and significant correlation with the function of the parathyroid glands.11One study showed that a drop in PTH >30% 10 minutes after the surgery was linked with an increased risk of postoperative hypocalcemia with sensitivity and specificity over 90%. The gene discussed is PTH; the disease is Hypocalcemia.