Results of other laboratory tests performed to help assess the cause of the hypercalcemia were as follows: thyroid stimulating hormone 4.51 IU/ml (normal range 0.41 to 4.5 IU/ml); parathyroid hormone (PTH) 3.4 pg/ml (normal range 15 to 65 pg/ml); 1,25-dihydroxyvitamin D 49.4 pg/ml (normal range 15.9 to 55.6 pg/ml); and 24-hour urinary calcium 856.55 mg (normal range 100 to 300 mg/24 hours). Here, PTH is linked to hypercalcemia disease.