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FIT is a quantitative, highly specific test to detect blood in stool for malignant and non-malignant colorectal diagnoses. Incidence of normal colonoscopy following positive FIT is not widely reported. We conducted a retrospective audit to analyse this patient cohort to evaluate diagnostic accuracy and reporting standards of colonoscopy. Method FIT-positive was defined as &amp;gt; 10µgHb/g faeces. Using FIT value, patients were separated into Groups 1, 2 and 3: 10-99, 100-200 and &amp;gt;200µgHb/g faeces respectively. Normal colonoscopy was defined as no neoplastic or benign findings reported. Patients referred in the 2WW-pathway after introduction of FIT-testing in October 2019 to the onset of COVID-19 pandemic in March 2020 were included. Data on age, gender, comorbidities and additional investigations were collected. Results There were 1072 referrals in the study period; 405 had FIT done, 265 were FIT-positive and had colonoscopy referral. Four patients were excluded after further investigations showed diverticulosis and gastritis. FIT-stratified normal-colonoscopy rate was 13.3% (28/210) overall, and 14.1% (23/163), 16.7% (2/12) and 8.6% (3/35) for Group 1, 2 and 3 respectively. Conclusions Our study was limited by the onset of COVID-19 pandemic. In the short study period, 13.3% FIT-positive patients had normal colonoscopy. There are no comparative data in literature for this parameter. Higher FIT-values were associated with lower normal colonoscopy incidence. It is possible that some endoscopists failed to record positive, non-clinically significant findings. We are currently studying larger patient cohorts and in parallel, looking at Bowel Cancer Screening Programme (BCSP) patients.

british journal of surgery

434 Incidence of Normal Colonoscopy in Faecal Immunochemical Test (FIT) Positive Patients in The Colorectal 2-Week-Wait (2WW) Pathway at A District General Hospital (DGH)