Feasibility of an newly programmed offline application for smartphones (SPA, APP) for colonoscopy preparation offering a 5 day guidance prior colonoscopy containing dietary- and behavioral recommendation.

First feasibility testing of a newly programmed app/SPA for android system named Colopr-APP. It is an strictly offline working, autonomous system downloaded to the smartphone. It creates an 5-day guidance prior outpatient colonoscopy with dietary and behavior recommendations.

Inclusion Criteria:

• outpatient colonoscopy
• smartphone owner with android system

Exclusion Criteria:

• chronic renal failure
• anticoagulants
• pregnancy
• diabetes mellitus (IDDM)