A rectal suction biopsy is a procedure used to extract a tissue sample from the rectum for laboratory analysis. The rectum is the lowest six inches of the large intestine, and is located just above the anal canal. Its purpose is to store the body’s solid waste until it is released.
A rectal biopsy is an important tool for determining the causes of abnormalities in the rectum. It helps to diagnose problems that are identified in screening tests such as anoscopy or sigmoidoscopy.
Each test uses a different type of scope to observe the inner lining of the colon and rectum. The tests can identify the presence of conditions such as tumors, polyps, bleeding, or inflammation. However, anoscopy and sigmoidoscopy alone are limited in determining the causes of these abnormalities.