The genes for each disorder are indicated in italics, and additional details are provided in Table 1. *, In PHP the plasma PTH is high. [Adapted from Thakker RV, Bringhurst FR, Juppner H. Regulation of calcium homeostasis and genetic disorders that affect calcium metabolism. In: De Groot LJ, Jameson JL, eds. Endocrinology. 7th ed. Philadelphia, PA: Elsevier; 2016:1063–1089 (67) with permission.]