primary hyperparathyroidism vs familial hypocalciuric hypercalcemia - USMLE Forums
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Old 03-01-2012
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Question primary hyperparathyroidism vs familial hypocalciuric hypercalcemia

How do u distinguish both these conditions just based on the lab findings?
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Old 03-14-2012
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1 Hyperparathyroidism = >PTH, >Ca in blood, >Ca in urine.

FHH = >PTH, >Ca in blood, HYPOCALCIURIA
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Old 03-14-2012
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Also check Phosphate level: low in parathyroid hyperplasia/adenoma, normal in FHH.

Bone resoprtion is increased in hyperparathyroidism, bone density scan should be abnormal.

In FHH, you have isolated findings of normal-high PTH, high Ca serum, everything else is normal. Plus, exlude the history of chronic renal failure.
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