Hereditary HR with hypercalciuria (HHRH, MIM 241530) is an autosomal recessive disease caused by inactivating mutations in the SLC34A3 (solute carrier family 34, member 3, also known as NaPi-2c, MIM 609826) (124). The gene discussed is SLC34A3; the disease is hereditary hypophosphatemic rickets with hypercalciuria.