VDDR-IA is characterized clinically by hypotonia, muscle weakness, growth retardation, hypocalcemic seizures, and skeletal deformities in early infancy, and radiographic findings of rickets with typical laboratory findings of hypocalcemia, elevated serum alkaline phosphatase (ALP) and parathyroid hormone (PTH), normal or increased serum 25-(OH) D3 and decreased serum 1, 25-(OH)2D3 [4]. The gene discussed is PTH; the disease is rickets.