A nurse is reviewing the laboratory report of a client who has hyperparathyroidism. The nurse should expect which of the following findings?

A. Increased phosphate level: Parathyroid hormone promotes renal phosphate excretion, so phosphate levels are usually low, not elevated. B. Decreased parathyroid hormone level: In hyperparathyroidism, parathyroid hormone levels are elevated, not decreased. C. Decreased calcium level: Calcium is typically elevated because PTH increases bone resorption and calcium reabsorption. D. Increased magnesium level: Bone resorption and altered renal handling can lead to elevated or high-normal magnesium, making this an expected finding.