A 52-Year-Old Patient Has Just Passed a Kidney Stone and Has

Multiple Choice

A 52-year-old patient has just passed a kidney stone and has high levels of calcium in her urine. Blood tests show high levels of calcium in her blood as well. What subsequent lab results would be most likely to distinguish between primary hyperparathyroidism and hypercalcemia of malignancy?

A) Parathyroid hormone level
B) Bone scan
C) Plasma phosphate levels
D) Serum magnesium level