Polyethylene glycol (PEG) bowel-prep kits for colonoscopy can require drinking up to 4 liters of liquid, while oral sodium phosphate kits typically require about 3 liters.
Sources
- How to Prepare for a Colonoscopy (webmd.com)
- https://www.yalemedicine.org/news/colonoscopy-prep-options (yalemedicine.org)
- https://gi.org/journals-publications/ebgi/a-new-pill-prep-for-colonoscopy/ (gi.org)
- https://www.uchicagomedicine.org/cancer/types-treatments/colorectal-cancer/screening-diagnosis/colonoscopy (uchicagomedicine.org)
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