This article describes the design and results of a study carried out to determine if the introduction of fecal tagging to CT colonography (CTC) makes the examination easier to tolerate or reduced the number of false-positives. The study analyzed the results obtained when the method of preparation of patients for CTC was changed from a laxative-only procedure to one using a radio-opaque contrast medium without laxative. This latter regimen was well tolerated, producing less diarrhoea than conventional laxative-based techniques. However we did not show that the use of fecal tagging reduced false positives.
