gastric bypass pt. with elevated calcium pre op

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I have a question in regards to a patient who has just undergone

gastric bypass. She was admitted one night prior to sx secondary to

elevated serum calcium levels (12.5). Her PTH was tested and was WNL.

According to her PCP her serum calcium levels have fluctated over the

past 2 years. She was placed on iv fluids and retested prior to sx,

where her levels were normal. Surgery went well. Before discharge her

serum calcium level was normal, however her Vit D,25 Hydroxy was 23 and

her ionized calcium was a bit low. Does anyone have any suggestions or

thoughts on this patient. It would be greatly appreciated, thanks!