To the Editor: Colorectal cancer is, after skin cancer, the most common cancer in Australia, with 11 245 new cases diagnosed in 1997, and over 4600 deaths.1 In clinical trials, screening programs using faecal occult blood testing (FOBT) have been shown to reduce mortality. The Commonwealth Department of Health and Ageing estimates that implementation of effective FOBT screening programs would save around 400 lives per year.1 However, such screening programs have not been widely implemented because of perceived difficulties with patient acceptance, funding, and the complexity of support structures.

General practitioners are in the front line of healthcare, and well placed to institute FOBT screening. Thus, we established an opportunistic screening program whereby patients over the age of 50 years attending surgery are asked by reception staff to complete a short questionnaire while in the waiting room. This questionnaire, developed locally to quickly establish whether a patient has symptoms or a family history of bowel cancer, is given to the GP by the patient during the consultation. If the questionnaire indicates colorectal symptoms, appropriate clinical assessment is undertaken. If a family history of colorectal cancer is elicited, the GP further defines the patient's risk by using the established National Health and Medical Research Council guidelines.2 If there are neither symptoms nor a family history, the patient is offered annual FOBT screening.

From 17 June to 30 September 2002, 731 patients under the care of 29 GPs completed the questionnaire. Our findings are summarised in the Box.

GP-based opportunistic screening can reach significant numbers of people. Moreover, unlike other strategies (eg, distribution of test kits by pharmacies), review by GPs of patients' questionnaires ensures that cases unsuitable for FOBT screening (such as those with previously undeclared symptoms or family history) are appropriately assessed.

Data reported so far on patients who completed general practice questionnaires for eliciting family history or symptoms of bowel cancer

FOBT = faecal occult blood testing.