Introduction: Patients with chronic diarrhea often undergo colonoscopy evaluation, however, the performance of biopsies or ileoscopy remains controversial. Objective: To evaluate the usefulness of colonoscopy plus biopsies in the study of patients with chronic diarrhea. Materials and methods: We retrospectively reviewed patients with chronic diarrhea who underwent colonoscopy between 2015 and 2019. Patients with incomplete data, HIV infection, abnormal endoscopic findings, colonoscopy without blind assessment, being on empiric treatment for diarrhea, and poor diagnosis were excluded. preparation. A descriptive analysis of the characteristics of the patients, histopathological findings and comparison of signs and symptoms according to histopathological finding was performed. Results: 535 patients with chronic diarrhea were evaluated, of these, 283 (52.8%) underwent biopsies. In 55....