LACK OF RESPONSE OF 1,25‐DIHYDROXYCHOLECALCIFEROL TO EXOGENOUS PARATHYROID HORMONE IN A PATIENT WITH TREATED PSEUDOHYPOPARATHYROIDISM

The response of serum 1,25‐dihydroxycholecalciferol (1,25‐OH2CC) concentration to the administration of parathyroid extract (PTE) was studied in a patient with pseudohypoparathyroidism (PHP) type I, 3 days after withdrawal of dihydrotachysterol (DHT) treatment. The patient had had a normal serum calcium (Ca), phosphorus (P) and immunoreactive parathyroid hormone (iPTH) level on DHT for 6 years. After PTE administration no rise of the 1,25‐OH2CC concentration and no response of urinary cAMP and P were seen.

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