A patient has ALP 3500 U/L, ACP 5.0 ng/mL, Ca 3.10 mmol/L. What is the likely diagnosis?

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Multiple Choice

A patient has ALP 3500 U/L, ACP 5.0 ng/mL, Ca 3.10 mmol/L. What is the likely diagnosis?

Massive osteoblastic bone turnover drives alkaline phosphatase to very high levels. Paget's disease (osteitis deformans) causes intense, disorganized bone remodeling, so the ALP can soar into thousands of units per liter. The acid phosphatase value isn’t similarly elevated, which helps point away from non-bone sources of phosphatase. Calcium can be normal or only mildly affected in Paget’s, so the standout clue here is the extreme ALP elevation. Other conditions listed either don’t raise ALP to such levels or show different patterns (for example, multiple myeloma typically has normal ALP, and hyperparathyroidism usually presents with more pronounced hypercalcemia but not such extreme ALP).

Massive osteoblastic bone turnover drives alkaline phosphatase to very high levels. Paget's disease (osteitis deformans) causes intense, disorganized bone remodeling, so the ALP can soar into thousands of units per liter. The acid phosphatase value isn’t similarly elevated, which helps point away from non-bone sources of phosphatase. Calcium can be normal or only mildly affected in Paget’s, so the standout clue here is the extreme ALP elevation. Other conditions listed either don’t raise ALP to such levels or show different patterns (for example, multiple myeloma typically has normal ALP, and hyperparathyroidism usually presents with more pronounced hypercalcemia but not such extreme ALP).

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