The current definition of hypoPT usually involves the following four indicators: (1) clinical manifestations, that is, whether there are symptoms and/or signs of hypocalcemia; (2) biochemical indicators, that is, serum PTH and/or serum calcium levels; (3) treatment indicators, that is, whether calcium and/or vitamin D treatment is needed to maintain no obvious symptoms and/or signs of hypocalcemia; and (4) duration, that is, the cutoff time that distinguishes transient and permanent hypoPT [4–8]. This evidence concerns the gene PTH and Hypocalcemia.