ARRT Patient Care Practice Exam

Ingestion of a gas-producing agent typically precedes which examination?

1. OCG only

2. Double contrast UGI only

3. Both OCG and double contrast UGI

4. IVP only

The correct answer is: Both OCG and double contrast UGI

The ingestion of a gas-producing agent is typically associated with both oral cholecystography (OCG) and double contrast upper gastrointestinal (UGI) examinations. For OCG, the gas-producing agent enhances the visualization of the gallbladder and biliary system by creating distinct contrasts between the structures and surrounding tissues. The audible gas and the resulting expansion can aid in better delineation during the imaging process. Similarly, in a double contrast UGI study, a gas-producing agent is utilized to inflate the stomach and intestines, allowing for a clear view of the mucosal lining. This method employs a combination of both a positive contrast agent (usually barium) and a gas (like carbon dioxide) to provide improved detail of the gastrointestinal tract. The gas aids in highlighting any abnormalities or lesions by separating the lumen from the surrounding tissues. Given that the ingestion of a gas-producing agent is crucial for enhancing the quality of images in both OCG and double contrast UGI examinations, it's evident that the correct choice reflects the shared preparation required for both procedures.