Measurement of urinary cyclic AMP (adenosine 3'5'-cyclic phosphate) and examination of calcium and phosphorus metabolism was carried out in two children with pseudohypoparathyroidism. In both patients infusion of parathyroid hormone failed to elicit any change in urinary cyclic AMP, while a dose-dependent increase in urinary cyclic AMP occurred in a normal control. The findings agree with concept of unresponsiveness of renal cortical tissue to parathyroid hormone in pseudohypoparathyroidism and provide further evidence that measurement of urinary cyclic AMP during parathyroid hormone infusion may be the method of choice in the diagnosis of this disease.
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