Biochemical hallmarks include hypokalemia (mean 3.02 mmol/L), hypocalcemia (mean 1.57 mmol/L), elevated PTH (mean 369.2 pg/mL), hyperphosphatemia (60%), hypomagnesemia (30%), and vitamin D deficiency (40%) (Table1 and 2). The gene discussed is PTH; the disease is Hypocalcemia.