Hyperparathyroidism, Primary

**Definition:** A condition of abnormally elevated output of PARATHYROID HORMONE due to parathyroid HYPERPLASIA or PARATHYROID NEOPLASMS. It is characterized by the combination of HYPERCALCEMIA, phosphaturia, elevated renal 1,25-DIHYDROXYVITAMIN D3 synthesis, and increased BONE RESORPTION.

**Tree numbers:** - C19.642.355.239

**Synonyms:** - Primary Hyperparathyroidism