The frequency of repeating a CT scan without a specific medical indication is generally not recommended. CT scans expose you to radiation, so it's best to minimize unnecessary exposure. It's important to consult with your healthcare provider to determine if a repeat CT scan is necessary based on your individual circumstances. To learn more, connect with me at drjeromepuryear.com. Thank you!

No guidelines I'm aware of if CT was for a 'health check'. If you have a diagnosed condition, that's different. As you age, your colonoscopy frequency will likely increase, as in the recent past. If you wanted to do a CT at the same time as colonoscopy that may be a reasonable plan.

Reword the question. CT colonography is a specialized form of CT (air distending a cleaned-out colon) that can help pick up colon malignancy by showing a gastroenterologist where a possible mass is for biopsy and a polyp for possible removal. Routine CT of the abdomen would typically not pick up a polyp within the colon. Decisions as to how often to undergo colonoscopy or CT colonography depend on age, family history, and medical organization recommendations. Talk to the gastroenterologist who ordered your original T if it was a CT colonography.