All invitees receive an invitation to complete a FIT (FOB-Gold) and a validated, online family history questionnaire. Answers from the questionnaire are compared with the Dutch criteria for referral for genetic testing and/or surveillance colonoscopies for persons at a potential familial risk for CRC. Invitees are invited to perform both tests, but if they only perform one this will be assessed. Participants with a positive FIT (cut-off value 275 ng/ml) and/or a positive family history and a diagnosis of familial CRC by a clinical geneticist will be referred for colonoscopy.