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Journal of Clinical Endocrinology & Metabolism, Vol 58, 744-747, Copyright © 1984 by Endocrine Society

ARTICLES

Vitamin D metabolism in familial benign hypercalcemia (hypocalciuric hypercalcemia) differs from that in primary hyperparathyroidism

WM Law Jr, S Bollman, R Kumar and H Heath 3d

We compared serum concentrations of immunoreactive PTH and plasma levels of vitamin D metabolites in 11 patients with adenomatous primary hyperparathyroidism and 32 individuals with the syndrome of familial benign hypercalcemia or familial hypocalciuric hypercalcemia (FHH). Serum immunoreactive PTH was elevated in the hyperparathyroid group but indistinguishable from control in FHH, despite comparable degrees of hypercalcemia. Plasma 25-hydroxyvitamin D concentrations were normal in both groups, but plasma 1,25-dihydroxyvitamin D levels in FHH were significantly lower than control (P less than 0.0025) or hyperparathyroid (P less than 0.01) values. FHH is pathogenetically distinct from primary hyperparathyroidism and should not be thought of simply as a variant of that condition.


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A. Wystrychowski, S. Pidasheva, L. Canaff, J. Chudek, F. Kokot, A. Wiecek, and G. N. Hendy
Functional Characterization of Calcium-Sensing Receptor Codon 227 Mutations Presenting as Either Familial (Benign) Hypocalciuric Hypercalcemia or Neonatal Hyperparathyroidism
J. Clin. Endocrinol. Metab., February 1, 2005; 90(2): 864 - 870.
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