24-Hydroxylase Deficiency and CYP24A1 Mutation Patient Registry

Inclusion Criteria: Patients who have undergone genetic testing for a CYP24A1 mutation with at least 3 of the following: * Urinary Stone Disease * Nephrocalcinosis * Metabolic Bone Disease * Serum Calcium \>/= 9.6 mg/dL * Parathyroid hormone (PTH) \< 30 pg/mL * 1,25-dihydroxyvitamin D \> 40 pg/mL OR a family member of a patient who meets the above criteria Exclusion Criteria: Patients who have tested negative for a CYP24A1 mutation with an alternative diagnosis that might explain hypercalcemia/hypercalciuria/stone disease: * Sarcoidosis * Lymphoma * Tuberculosis * Fungal infections * Excessive exogenous calcium or vitamin D intake