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Related Subjects: |Calcium Physiology |Calcitonin |Hypocalcaemia |Hypercalcaemia |Hypomagnesaemia |Hypermagnesaemia |Primary Hyperparathyroidism |Familial hypocalciuric hypercalcaemia (FHH) |Sarcoidosis
β οΈ Key: Always distinguish Familial Hypocalciuric Hypercalcaemia (FHH) from Primary Hyperparathyroidism (PHPT). Parathyroidectomy does not correct calcium in FHH β misdiagnosis can lead to unnecessary surgery.
Feature | FHH | PHPT |
---|---|---|
Age of onset | Often young, familial | Middle-aged/older |
Serum calcium | Mild β (stable) | β (often progressive) |
PTH | Normal/β (inappropriate) | β |
Urinary calcium | Low | Normal/β |
Clinical features | Usually asymptomatic | Stones, bones, GI + psych symptoms |
Family history | Often +ve | Usually sporadic |
Effect of parathyroidectomy | No effect | Cures |