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Main reason for last CT colonoscopy

Codes and Frequencies

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For sample adults aged 40 years and older who ever had a CT colonography or virtual colonoscopy (CTCOLEV), CTCOLLY reports the main reason that the respondent underwent the procedure.


The Field Representative's Manual advised that:

For any of the questions that asks, "What is the main reason you had this exam?". . . if the respondent had a problem, but was not sure which reason to pick, then record the first one she gives, as her initial thought is probably the best option.

See Survey Text and Codes tabs.

For more information, please see CTCOLEV.


There are no comparability issues.


  • 2010; 2015: Sample adults age 40+ who have had a CT colonography or virtual colonoscopy.


  • 2010, 2015