A New Quantitative Fecal Immunochemical Test in Detecting Colorectal Advanced Adenoma

Inclusion Criteria: * 50-75 years old people; * People sign an "informed consent form" Exclusion Criteria: * People with history of surgery in any part of the large bowel; * People with history of colorectal cancer; * People with history of other diseases that may produce fecal blood, such as active diverticulitis, inflammatory bowel disease, ischemic enteritis, vascular malformation of intestine, intestinal tuberculosis or Non-Hodgkin's lymphoma involving digestive tract; * People with symptoms including visible rectal bleeding, hematuria, hemorrhoid bleeds, severe and acute diarrhea and 7th type stool (Bristol feces score); * People are in pregnancy, lactation or menstrual phase; * People with severe congestive heart failure or other sever disease cause cannot tolerate colonoscopy.