DefinitionIdiopathic hypercalciuria is the presence of excess calcium in the urine without obvious cause. This condition can lead to kidney stones or osteoporosis.Alternative NamesHypercalciuria - idiopathicReferencesRosen C. Osteoporosis. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 264.