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Ever heard of CT colonography or virtual colonoscopy

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For sample adults aged 40 and older, CTCOLHEARD reports if the person had ever heard of CT colonography or virtual colonoscopy.

For more information about CT colongraphy or virtual colonoscopy variables available through IPUMS NHIS, please refer to CTCOLEV.


Respondents were told that:

"CT colonography, sometimes called virtual colonoscopy, is a new type of test that looks for cancer in the colon. Unlike regular colonoscopies, you do not need medication to make you sleepy during the test. In this new test, your colon is filled with air and you are moved through a donut-shaped X-ray machine as you lie on your back and then your stomach."


There are no comparability issues.


  • 2010; 2015; 2018: Sample adults aged 40+.


  • 2010, 2015, 2018