The carcinoembryonic antigen (CEA) blood test is included in most colorectal cancer follow up protocols, despite little clear evidence for its cost-effectiveness and survival benefit. In this study, patients' views were sought on the use of the CEA blood test in their follow up. Strong associations were found between the age of a patient's children and their concern about cancer recurrence and between concern about recurrence and anxiety about CEA test results (p<0.0001). Many patients expressed a desire for prognostic information, however uncertain or poor. Patients' views should be sought when designing colorectal cancer follow up protocols to ensure their needs are adequately addressed.