In primary hyperparathyroidism, parathyroidectomy is indicated when serum calcium is above normal by how much?

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Multiple Choice

In primary hyperparathyroidism, parathyroidectomy is indicated when serum calcium is above normal by how much?

Explanation:
In primary hyperparathyroidism, the decision to operate often hinges on where the calcium level sits relative to normal. The accepted surgical threshold is when serum calcium is about 1 mg/dL above the upper limit of normal. This level signals a higher risk of ongoing bone loss, nephrolithiasis, and other complications, so removing the overactive parathyroid tissue can prevent progression and improve bone and kidney outcomes—even if the patient doesn’t have obvious symptoms. If calcium is within or below the normal range, surgery isn’t indicated based on calcium alone.

In primary hyperparathyroidism, the decision to operate often hinges on where the calcium level sits relative to normal. The accepted surgical threshold is when serum calcium is about 1 mg/dL above the upper limit of normal. This level signals a higher risk of ongoing bone loss, nephrolithiasis, and other complications, so removing the overactive parathyroid tissue can prevent progression and improve bone and kidney outcomes—even if the patient doesn’t have obvious symptoms. If calcium is within or below the normal range, surgery isn’t indicated based on calcium alone.

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