These tests include mammograms, Pap smear tests, and colonoscopies as well as many others. Some of the most common procedures are cataracts, colonoscopies, and arthroscopic surgery. In these high risk groups, both prevention with aspirin and regular colonoscopies are recommended. Virtual colonoscopies carry risks that are associated with radiation exposure. There was immediate demand for his procedure, with his performing 20 colonoscopies a day.