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There are no guidelines for the recommended interval to the next examination after colonoscopy with suboptimal bowel preparation.

To identify factors associated with early repeat colonoscopy after initial examinations with suboptimal preparations and to measure adenoma miss rates in this context.

Retrospective study.

Hospital-based endoscopy unit.

Bowel preparation quality was recorded in 12,787 patients.

Of 12,787 colonoscopies, preparation quality was suboptimal (poor or fair) in 3047 patients (24%). Among these 3047 patients, repeat examination was performed in <3 years in 505 (17%). Factors associated with early repeat colonoscopy included lack of cecal intubation (odds ratio [OR] 3.62, 95% confidence interval [CI], 2.50-5.24) and finding a polyp (OR 1.55, 95% CI, 1.17-2.07). Among 216 repeat colonoscopies with optimal preparation, 198 adenomas …