Pseudohypoparathyroidism type-1b is a hereditary disorder of clinical hypoparathyroidism without AHO phenotype, characterized by blunted nephrogenous cyclic-AMP (cAMP) response to exogenous parathyroid hormone (PTH). Here we report a young adult presenting with hypocalcemic tetany with raised PTH levels. His urinary cAMP response to exogenous PTH (recombinant 1-34) was blunted; however, phosphaturic response was normal.
Keywords: Parathyroid hormone; pseudohypoparathyroidism; urinary cyclic-AMP.