Small colon polyps which are found during colonoscopy insertion are sometimes difficult to find during withdrawal and thus missed. The investigators aim to evaluate the differences of colon polyp/adenoma detection rates of patients undergoing additional inspection and polypectomy during insertion as compared to the patients undergoing traditional practice of careful inspection and polypectomy performed entirely during withdrawal of colonoscopy.
Name: Colon polypectomy
Description: Colon adenoma detection rate is defined as the proportion of colonoscopies where at least one adenoma is found.Measure: Percentage of Participants With Detection of at Least One Adenoma Per Procedure Time: During procedure, approximately one hour
Description: Mean colon adenoma per procedure is defined as the total number of adenomas detected divided by the number of colonoscopies.Measure: Mean Colon Adenoma Per Colonoscopy Time: During procedure, approximately one hour
There is one SNP
Colonoscopies will be performed by two experienced investigators by using a standard colonoscopy (CF-Q260AI or CF-Q260AL; Olympus Medical Systems Corp., Tokyo, Japan). --- Q260A ---