Several reasons: Pipida or hida scan is nuclear medicine test for gall bladder function. Gb does not visualize when gb has acute cholecystitis and patient acutely ill. Also patients with chronic gall bladder duct obstruction will not have gb visualization. Sometimes gb will not be seen well in extreme prolonged fasting, wit certain pain meds and when patient fed by tpn, total intravenous nourishment.
Answered 4/24/2016
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