Observational study The aim of this observational study is to investigate the effect of water temperature used during pre-colonoscopy bowel preparation on the quality of bowel cleansing. The primary research question to be addressed is as follows: Which water temperature results in better bowel cleansing quality? For this purpose, patients will be divided into two groups based on the use of warm water or cold water, and the quality of bowel preparation will be compared between the groups.

The aim of this observational study is to investigate the effect of water temperature used during pre-colonoscopy bowel preparation on the quality of bowel cleansing. The primary research question to be addressed is as follows: Which water temperature results in better bowel cleansing quality? For this purpose, patients will be divided into two groups based on the use of warm water or cold water, and the quality of bowel preparation will be compared between the groups.

Inclusion Criteria: -Patients aged ≥ 18 years undergoing elective colonoscopy -Ability to provide informed consent -Planned bowel preparation using water-based regimens -No contraindication to warm or cold water intake

Exclusion Criteria: - Emergency colonoscopy -History of inflammatory bowel disease -Prior colorectal surgery -Severe heart failure, renal failure, or electrolyte imbalance -Pregnancy -Inability to complete bowel preparation protocol -Use of additional laxatives outside the study protocol

patients admitted to the general surgery endoscopy clinic of a tertiary-care hospital for colonoscopy

All study data will be retained by the principal investigator and may be shared when required.