Alle patienter med colitis ulcerosa, som har forhøjet risiko for dysplasi eller colon cancer (for eksempel patienter med langvarig colitis ulcerosa eller primær sklerotisk cholangitis), eller som tidligere har haft dysplasi eller colon cancer, bør screenes for dysplasi med reglmæssige intervaller før behandling og under deres sygdomsforløb.
All patients with ulcerative colitis who are at increased risk for dysplasia or colon carcinoma (for example, patients with long-standing ulcerative colitis or primary sclerosing cholangitis), or who had a prior history of dysplasia or colon carcinoma should be screened for dysplasia at regular intervals before therapy and throughout their disease course.