Serum calcium was 10.5 mg/dL (albumin: 4.1 g/dL), indicating hypercalcemia; phosphorus was within normal limits at 3.3 mg/dL. Serum 25-hydroxyvitamin D was normal (38.2 nmol/L), and PTH was markedly elevated at 549 pg/mL. Here, PTH is linked to Hypercalcemia.