Familial hypocalciuric hypercalcaemia

Familial hypocalciuric hypercalcaemia is a benign inherited disorder caused by mutations in the calcium-sensing receptor, leading to lifelong mild hypercalcaemia with low urinary calcium excretion. It is important to distinguish from primary hyperparathyroidism to avoid unnecessary surgery. Unlike hyperparathyroidism, it rarely causes complications or requires treatment.