Laboratory Tests(For key data, refer to Table 1; additional laboratory test results are available in Supplementary Table 1): The patient exhibited hypercalcemia, hypocalciuria, hypokalemia, hypomagnesemia and hypophosphatemia, low or deficient levels of 25-hydroxyvitamin D, and normal or mildly elevated PTH levels. The gene discussed is PTH; the disease is familial primary hypomagnesemia.