CHORUS
Collaborative Hypertext of Radiology
Liver and biliary system
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oral cholecystogram (OCG)
dose: 6 x 0.5 gram tablets after evening meal
peak opacification in 14-19 hrs. (13-35% excreted in urine)
patient selection:
- bilirubin < 5mg% (unless secondary to hemolysis)
- contraindicated in serious liver disease
- relative contraindications in peritonitis,
postoperative ileus, acute pancreatitis
nonvisualization of gallbladder
- cholecytectomy, obstruction of cystic duct, chronic cholecystitis
- anomolous position of GB
- extrabiliary causes
- fasting state
- failure to reach absorptive surface of bowel (e.g. malabsorption)
- deficiency of bile salts (Crohn disease, surgical resection
of TI, liver disease, cholestyramine therapy, abnormal
communication between biliary and GI tract)
Yong H. Hahn, MD - 2 February 1995
Last updated: 1 October 2013
Copyright © 2013, Charles E. Kahn, Jr.
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