Serum Albumin Concentrations Predict hypovolaemia Caused by Polyethylene Glycol Plus Ascorbic Acid Prior to Colonoscopy in Elderly Patients.

Background Previous studies have confirmed the safety of polyethylene glycol plus ascorbic acid for healthy middle-aged adults but not for the elderly. The osmotic pressure of polyethylene glycol plus ascorbic acid is approximately twice that of plasma osmolality and may cause dehydration.