What is the difference between anoscopy and colonoscopy?

You are talking about anoscopy and colonoscopy, anoscopy belongs to a kind of colonoscopy, only the observation part is relatively shallow, can only look at the anus and rectum parts, so called anoscopy, colonoscopy is mainly used for observation of the whole colon with, but also can look at the anus and rectum.

If the disease is considered to be near the anus, an anoscopy can be used, if the disease is considered to be in a deeper location need to use a colonoscopy, and an anoscopy does not need to prepare the intestines, while the colonoscopy needs to be prepared for the intestines.