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When you see a polyp for the first time, you need to take 1-2 biopsies from it. In the follow-up endoscopy, however, no more biopsy is required for a hyperplatic polyp.
There are some exceptions. Take biopsies in the follow-up endoscopy, if (1) the polyp increased significantly (>30% in diameter), or (2) malignant change is suspected.