Correct!
5. All of the above

The causes of hypercalcemia can be largely divided into two categories: excessive release of calcium from bones or increased absorption from the gastrointestinal tract. Pertinent findings of her laboratory evaluation of hypercalcemia are shown in Table 1.

Table 1. Pertinent laboratory tests.

Which of the following mechanism(s) are most consistent with the cause of the hypercalcemia in our patient? (Click on the correct answer to proceed to the fourth of six panels)

1. Overproduction of 1,25-dihydroxy vitamin D3
2. Overproduction of parathyroid hormone due to primary hyperparathyroidism
3. Overproduction of parathyroid hormone-related protein
4. 1 and 3
5. All of the above

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