Colonoscopy is an endoscopic method by which diseases of the lower gastrointestinal tract or colon are detected and therapeutically treated. Throughout history, only the large intestine has been examined, while today the procedure also includes an examination of part of the small intestine. Colonoscopy is performed using a colonoscope with which the rectum, sigmoid colon, descending, transverse, ascending colon, cecum, ileocecal valve and appendix estuary are examined. Objectives: To examine the differences in the quality of bowel cleansing in hospitalized patients at the Clinical Hospital Center Rijeka at the Department of Gastroenterology and hospitalized patients of other departments at the Clinical Hospital Center Rijeka who are referred for colonoscopy Subjects and methods: The study was conducted by retrospective analysis of the medical records of hospitalized patients from the hospital information system of the Clinical Hospital Centre Rijeka. A convenient sample was used, i.e. a deliberate sample that includes 253 hospitalized patients with an indication for colonoscopy. The conducted sample of respondents was observed from the period from 1 January 2023 to 31 December 2023. Results: There is no significant difference in the quality of preparedness of hospitalized patients for colonoscopy between the Department of Gastroenterology and other departments of the Clinical Hospital Centre Rijeka. There is a correlation in the quality of colon cleansing for colonoscopic examination in hospitalized patients in relation to patient mobility (P=0.01, P=0.05) Rasprava: The study shows that age and gender do not have a statistically significant impact on the quality of colon cleansing.While other studies confirm that age and male gender have a statistically significant association with inadequate bowel preparation.Certain indications have proven a statistically significant correlation with the quality of clearance following diabetes, constipation, cirrhosis, history of stroke, opioid use and smoking. In this study, the indications for which the patient is referred for a colonoscopy examination did not show a significant statistical correlation with the quality of colon cleansing. It has been proven that mobility has a significant statistical correlation in the quality of colon cleansing, which has been confirmed by this study. Conclusion: In this study, the hypothesis that there is a correlation in the quality of colon cleansing for colonoscopic examination in hospitalized patients in relation to patient mobility was confirmed and the hypothesis that there is a correlation in the quality of colon cleansing for colonoscopic examination in hospitalized patients in relation to age, gender and indications for examination was rejected.