Final answer:
The most common catheter size used in CT scanning is 18-22, with the 18-gauge size being particularly typical, balancing insertion ease with efficient contrast media delivery.
Step-by-step explanation:
The most common catheter size used in CT (Computed Tomography) scanning is 18-22. When performing contrast-enhanced scans, professionals often choose catheters within this range to ensure that a sufficient volume of contrast material can be delivered safely and efficiently into the bloodstream.
Specifically, a size 18-gauge is most typically utilized, providing a good balance between ease of insertion and the rate at which contrast media can be administered.