Hypoparathyroidism (HP) and pseudohypoparathyroidism (PHP) are a group of heterogeneous conditions in which hypocalcemia and hyperphosphatemia occur as a result of deficient parathyroid hormone (PTH) secretion or end‐organ PTH resistance (Thakker 2004). This evidence concerns the gene PTH and pseudohypoparathyroidism type 1A.