The cleansing enema. How many for a good quality double-contrast enema?

The effects of the 'tap-water enemas till clear' method of bowel cleansing on the technical quality of double-contrast enema (DCE) were studied in 123 outpatients referred for DCE. Patients with one or two tap-water enemas (1.75 litres) before the DCE had significantly more faecal residue and flocculation of contrast medium than patients with three or more enemas. However, the number of enemas did not correlate significantly with mucosal coating. The results suggest that at least three tap-water enemas should be given before DCE.