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In a patient with hypercalcemia and an asymptomatic renal stone, how would you differentiate various causes of hypercalcemia?
| Serum calcium | PTH | Urine calcium excretion | |
| Primary hyperparathyroidism | High | High | High |
| Familial Hypocalciuric hypercalcemia | High | High | Low |
| Lithium use | Normal/High | High | High |
| Hydrochlorothiazide use | Normal/High | Normal | Low |
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