Laboratory testing at the age of 6 years revealed hypocalcemia with a serum calcium level of 2.1 mmol/L (normal, 2.2–2.65 mmol/L), hyperphosphatemia with a serum phosphorus level of 12.34 mmol/L (normal, 1.0–1.95 mmol/L), hypoparathyroidism with a serum intact parathyroid hormone (PTH) level of 0.7 pmol/L (normal, 1.06–7.31 pmol/L), hypercalciuria with a 24‐hr urinary calcium level of 53.67 mg (normal, 1.96–2.66 mg), and slightly reduced serum 1,25(OH)2D 20 ng/ml (normal, 21–65 ng/ml). The gene discussed is PTH; the disease is Hypocalcemia.