A rare heterogeneous group of metabolic disorders characterized by abnormal calcium metabolism due to deficient secretion of parathormone (PTH), without other endocrine disorders or developmental defects. The disease is Monarch Disease Ontology id MONDO_0016390 (familial hypoparathyroidism). Also known as: FIH, Familial Isolated Hypoparathyroidism, familial isolated hypoparathyroidism, hypoparathyroidism familial isolated, hypoparathyroidism, familial, hypoparathyroidism, familial isolated.