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

A. Phosphate 5.7 mg/dL: Hypoparathyroidism leads to low PTH → decreased renal phosphate excretion → elevated serum phosphate; a value of 5.7 mg/dL reflects hyperphosphatemia expected with hypoparathyroidism. B. Magnesium 1.8 mEq/L: A magnesium of 1.8 mEq/L is within normal range and is not the defining lab abnormality of hypoparathyroidism. C. Calcium 9.8 mg/dL: A calcium of 9.8 mg/dL is within normal limits; hypoparathyroidism typically produces hypocalcemia (low serum calcium). D. Vitamin D 25 ng/mL: A 25 ng/mL vitamin D level is borderline insufficient but is not the primary laboratory finding used to identify hypoparathyroidism (the hallmark is low calcium with high phosphate).