Inclusion Criteria :  18 years < Patient < 85 years Need to perform a primary and / or secondary screening colonoscopy for colorectal cancer Patients candidates for outpatient care  Exclusion Criteria :  History of inflammatory digestive tract disease Failed previous colonoscopy Known familial polyposis Biopsy / polypectomy contraindication (coagulation disorder, treatment with CLOPIDOGREL / Anticoagulant)