MSD Manual

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Colonoscopy: Obtaining a Biopsy Sample
Colonoscopy: Obtaining a Biopsy Sample
Colonoscopy: Obtaining a Biopsy Sample

Colonoscopy is a form of endoscopy used to view the large intestine. The intestinal lining initially appears smooth and normal, but a bulging, discolored, and abnormal growth is later seen. Next, small clippers attached to a metal wire are inserted through the endoscope and used to grab the growth. A tissue sample is removed for biopsy. The small amount of blood seen is normal after a biopsy.

Courtesy of Jerome D. Waye, MD.