CAMRT Radiography Practice Exam

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Which gauge allows for the highest rate of injection for an intravenous contrast injection CT procedure?

  1. 18 gauge

  2. 25 gauge

  3. 20 gauge

  4. 22 gauge

The correct answer is: 18 gauge

The 18 gauge needle is the most suitable choice for achieving the highest rate of injection for intravenous contrast during a CT procedure. This is due to its larger lumen size compared to the other options, which facilitates a faster flow of contrast material into the bloodstream. A larger gauge number corresponds to a smaller diameter needle, meaning that needles with larger gauge numbers, like 25 gauge or even 22 gauge, will have a constricted flow rate and will take longer to administer the contrast. In situations requiring rapid injection, as is often the case in imaging studies, the 18 gauge needle is optimal for ensuring efficient delivery of contrast media, which is crucial for high-quality imaging and patient safety.

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