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Colonoscopy is the gold standard investigation for the diagnosis of colonic disease and colorectal cancer screening but is technically demanding and operator-dependent. We operate highdefinition (HDTV)processor endoscopy stacks with magnetic trackers, alongside older (non-HD) endoscopy equipment and have investigated whether the equipment used influences completion rates.Analysis of 6 months ofprospectively collected endoscopy unit audit data. Comparisons between groups were conducted using Fishers exact test (2-tailed) in GraphPad.One thousand nine hundred and thirty two colonoscopies were performed by 20 accredited endoscopists. All but three used both HDTV and non-HDTV stacks. Unadjusted completion rates were 93.45% using HDTV stacks (824 attemptedprocedures) vs 91.79% (1108 attemptedprocedures) with non-HDTV stacks (P = 0.190). Higher completion rates with HDTV stacks were noted for non-surgical operators (95.54% vs 91.13%, P = 0.019), and for low volume operators (< 100 colonoscopies attempted during the study period, n = 10; 95.12% vs 87.19%, P = 0.004). Higher case volume operators (P = 0.087) had no difference.Use of HDTV and availability of a magnetic tracker appears to increase colonoscopy completion rates by 1.5-2%. Results suggest that non-surgeons and/or those undertaking relatively fewerprocedures benefit the most. Differences in the reasons for incomplete examinations, time to caecal intubation and patient comfort should be investigated further.