presence of fluid collection.

Other Tests: Supporting tests include phosphatase, aspartate amino transferase (AST), lactate dehydrogenase (LDH), alkaline phosphatase, serum amylase, and serum bilirubin levels; oral cholecystogram (OCG), computed tomography (CT). An IV cholangiogram may be used to differentiate cholelithiasis from other causes of extrahelpatic obstruction. A hydroxy iminodiacetic acide (HIDA) scan can show nonfilling of the gallbladder.

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