Blood tests showed hypocalcemia (6.8 mg/dL) and low intact parathyroid hormone (PTH) (14 pg/mL), as well as low urinary calcium to creatinine ratio (0.0005 mg/mg) and normal levels of 25-OH Vitamin D and serum magnesium, leading to the diagnosis of tetany secondary to hypoparathyroidism (Table 1). This evidence concerns the gene PTH and Hypocalcemia.