Familial hypocalciuric hypercalcaemia. II. Intestinal calcium absorption and vitamin D metabolism.
We compared intestinal calcium absorption, measured by a single isotope technique, and serum concentrations of vitamin D metabolites in ten patients with familial hypocalciuric hypercalcaemia (FHH) and ten age- and sex-matched healthy controls. Our results showed no significant differences in intestinal calcium absorption or in serum concentrations of vitamin D metabolites. There was a significant correlation between serum concentrations of PTH, measured with one of our assays, and 1,25(OH)2D. We conclude that neither increased intestinal calcium absorption nor altered vitamin D metabolism plays a part in the hypercalcaemia of FHH.
D002118:Calcium / Q000378:metabolism* / Q000652:urine; D006801:Humans; D006934:Hypercalcemia / Q000097:blood / Q000235:genetics* / Q000378:metabolism; D007408:Intestinal Absorption; D014807:Vitamin D / Q000097:blood / Q000378:metabolism
D014807:Vitamin D; D002118:Calcium