PTH and pseudohypoparathyroidism: Pseudohypoparathyroidism (PHP) is a group of genetic disorders characterized by end-organ resistance to parathyroid hormone (PTH) and often the Albright hereditary osteodystrophy phenotype (AHO; short stature, brachydactyly, subcutaneous ossifications, obesity and developmental delays) with a prevalence of 0.3–1.2 cases per 100,000 population [1,2,3,4,5].