The registers needed are described in detail in the European guidelines for quality assurance in CRC screening {6}: “Relevant data on each individual and every screening test performed must be recorded, including the test results, the decision made as a consequence, diagnostic and treatment procedures and the subsequent outcome, including cause of death, should be ensured. The data must be linked at the individual level to several external data sources including population register, cancer or pathology registries, and registries of cause of death in the target population, to be able to evaluate the effectiveness of screening.

Legal authorisation should be put in place when the screening programme is introduced in order to be able to carry out programme evaluation by linking the above-mentioned data for follow-up.”