How is a balloon expulsion test performed in the workup of constipation?

Updated: Mar 30, 2020
  • Author: Marc D Basson, MD, PhD, MBA, FACS; Chief Editor: BS Anand, MD  more...
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In balloon expulsion test, a balloon filled with varying amounts of water is inserted rectally. The patient is asked to expel the balloon. Decreased ability to expel a balloon filled with 150 mL of water suggests decreased defecatory ability.

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