Bowel Cleansing With Renal Impairment

The patients will receive the preparation standards according to the usual clinical practice of each center. On the day of the colonoscopy, patient will be informed about this study and the informed consent will be requested to record the study information. Then, an analysis will be carried out. A second visit will be carried out, follow-up at 3-7 days, which will include a clinical interview and an analysis, being the unique intervention that patients receive.