TarmTjek is designed for individuals undergoing a colonoscopy at Herlev Hospital. Prior to the procedure, the app guides users through a bowel cleansing regimen. By inputting the examination time, the app calculates the cleansing schedule. Users receive reminders for taking cleansing agents at specific times and are advised on dietary restrictions.

The app includes a timeline for task management and offers recipe inspiration, information on the colonoscopy procedure, and details on medications administered during the examination. It is important to note that TarmTjek is not a treatment tool; the responsibility for treatment lies with the attending physician. For inquiries regarding the cleansing process or treatment, users are directed to contact Region Hovedstaden, as indicated in the app or examination invitation.