Patients with idiopathic hypercalciuria (IH), defined as excessive uCa without a demonstrable metabolic cause, generally have normal serum (s) Ca, normal or elevated s1,25(OH) 2D 3 (1,25D), normal or elevated s parathyroid hormone (sPTH), normal or low s phosphate (sP). At least a third of these patients have no demonstrable metabolic cause for the increased urinary (u) Ca excretion and are classified as having idiopathic hypercalciuria (IH). The majority of patients who form calcium (Ca)-containing kidney stones are hypercalciuric as compared to non-stone formers( 1- 5).
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