Disorders of the parathyroids or parathyroid hormone system

**Definition:** Disorders of the parathyroids and parathyroid hormone system generally refer to conditions with inappropriate secretion and/or actions of parathyroid hormone that cause dysregulation of calcium metabolism.

**Exclusions:** - Hypocalcaemic vitamin D resistant rickets - Hypocalcaemic vitamin D dependent rickets - Hypovitaminosis D - Hyperphosphataemic familial tumoural calcinosis