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If your doctor refuses to do a colonoscopy, then you likely do not need one. If a colonoscopy is not indicated, then your doctor may refuse to do one, as they are not without risk and shouldn't be done unless indicated. Everyone should have a colonoscopy after their 50th birthday, and some people with other risk factors will need one earlier than that. Follow-up colonoscopies are done depending on the findings of your first colonoscopy.