CAMRT Radiography Practice Exam

What is the recommended weight/volume percentage of barium for single contrast GI studies?

1. 10-20%

2. 20-30%

3. 30-50%

4. 50-70%

The correct answer is: 30-50%

The recommended weight/volume percentage of barium for single contrast gastrointestinal (GI) studies is typically 30-50%. This range is optimal because it provides a sufficient density of the barium sulfate suspension needed to effectively outline the GI tract during imaging. Barium must be dense enough to absorb X-rays and create a clear contrast against surrounding tissues, allowing for better visualization of structures such as the esophagus, stomach, and intestines. When considering the other ranges, 10-20% may not provide adequate contrast for clear imaging, as the barium content would be too low to effectively coat and delineate the GI tract. A 20-30% concentration, while slightly more effective than the lower range, still may not achieve the ideal contrast necessary for a comprehensive examination. Conversely, concentrations of 50-70% are typically too viscous and can lead to problems with passage through the digestive system, increasing the risk of complications such as impaction. Therefore, the 30-50% range strikes a balance between providing good contrast for visualization while maintaining adequate flow and safety during the procedure.