The purpose of this study is to analyze if integration of new media (SMS) could improve the quality of colonoscopy preparation.

The study approach is the implementation of new media into colonoscopy preparation. As most of our patients already use mobile phones the study should evaluate if time adjusted information about diet recommendation, laxative intake and behavioral recommedation improve the patient compliance and the quality of colonoscopy preparation. In total 14 SMS wil be sent to the study participants starting 4 days prior the colonoscopy appointment. No additional or different information is provided in comparison to regular colonoscopy preparation for out-patient colonoscopy.

Study participant are randomized when included into the study. Group 1 receives a SMS- supported colonoscopy preparation, group 2 receive no SMS and prepares regularly.

Primary endpoint is bowel cleanness measured by Boston Bowel preparation scale, secondary endpoints are patient satisfaction, adenoma detection rate and compliance.

Inclusion Criteria:

• over 18 years old
• written informed consent
• mobile phone user
• appointment for outpatient colonoscopy

Exclusion Criteria:

• no outpatient colonoscopy
• no mobile phone