Medicine Endocrinology 2c74332b Not a marker for hyperparathyroidism is - A Increase in serum calcium B Increase in 24 hour urinary calcium excretion C Increase in serum calcitonin D Subperiosteal resorption of phalanges High-Yield Explanation markers include increased serum calcium, 24-hr urinary calcium , creatinine clearance, bone mineral density ( Harrison 17 pg 2383)