title: Fluid and electrolyte disorders. Calcium.
abstract: Parathyroid hormone, 1,25-dihydroxyvitamin D, and calcitonin are the three primary calcium-regulating hormones. Physiological changes in these occur throughout normal life but it is when levels remain excessively high or low, or when their target organs are diseased, that hypocalcaemia or hypercalcaemia may develop.
mesh_terms: D000328:Adult; D000368:Aged; D001842:Bone and Bones / Q000378:metabolism; D002116:Calcitonin / Q000502:physiology; D002117:Calcitriol / Q000502:physiology; D002118:Calcium / Q000378:metabolism*; D005260:Female; D005333:Fetus / Q000378:metabolism; D006706:Homeostasis; D006801:Humans; D006934:Hypercalcemia / Q000209:etiology*; D006996:Hypocalcemia / Q000209:etiology*; D007231:Infant, Newborn; D010281:Parathyroid Hormone / Q000502:physiology; D011247:Pregnancy
chemical_list: D010281:Parathyroid Hormone; D002116:Calcitonin; D002117:Calcitriol; D002118:Calcium