Autosomal dominant inheritance of hypercalciuria

We examined 37 first and second degree relatives of 10 children with hypercalciuria. In 2 families only the index patient was affected, while in 8 others one of the parents was hypercalciuric; in the total of 47 persons examined 23 cases of "idiopathic" hypercalciuria could be identified. None of the subjects was hypercalcemic. The pedigrees suggest autosomal dominant inheritance of the trait.