Normal labs including PTH and calcium are most consistent with which condition?

Normal labs including PTH and calcium are most consistent with which condition?

• A. Osteoporosis
• B. Primary hyperparathyroidism
• C. Hypercalcemia due to malignancy
• D. Rickets

Answer: (A)

Normal calcium and PTH point to intact calcium regulation, so the issue is not a calcium-endocrine disorder but a bone-density problem. Osteoporosis causes decreased bone mass with normal serum calcium and PTH, which fits the scenario. In contrast, primary hyperparathyroidism raises calcium (and PTH levels inappropriately), hypercalcemia of malignancy elevates calcium with suppressed PTH, and rickets typically features abnormal calcium (often low) with secondary hyperparathyroidism. So the normal labs best align with osteoporosis.

Normal calcium and PTH point to intact calcium regulation, so the issue is not a calcium-endocrine disorder but a bone-density problem. Osteoporosis causes decreased bone mass with normal serum calcium and PTH, which fits the scenario. In contrast, primary hyperparathyroidism raises calcium (and PTH levels inappropriately), hypercalcemia of malignancy elevates calcium with suppressed PTH, and rickets typically features abnormal calcium (often low) with secondary hyperparathyroidism. So the normal labs best align with osteoporosis.