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Main reason for last colonoscopy

Codes and Frequencies

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For sample adults aged 40 and older who ever had a colonoscopy (COLEV), COLLY reports the main reason that the respondent had their most recent colonoscopy.

For more information, please see COLEV.


The 2010 and forward Field Representative's Manual advised:

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.


There are no comparability issues.


  • 2010; 2013; 2015; 2018: Sample adults age 40+ who have had a colonoscopy.


  • 2010, 2013, 2015, 2018