In a group of patients with idiopathic hypercalciuria and an increased fasting urinary calcium excretion we re-examined the question: does secondary hyperparathyroididsm exist? Eight out of 51 patients with calcium renal stones had a high calcium excretion in both fasting and in 24 h urines. The carboxyl-terminal immunoreactive PTH (iPTH) values in these patients were 16±5 ngeq/ml (M±SD), no higher than the iPTH values in the other groups, e.g. normocalciuric patients had an iPTH of 23±8 ngeq/ml. The existence of secondary hyperparathyroidism in a subgroup of stone patients with increased fasting urinary calcium excretion is questionable.
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