Houston Methodist. Leading Medicine.
Houston Methodist. Leading Medicine

Anorectal Manometry

Testing Information: Anorectal Manometry

What is Anorectal Manometry?

Anorectal Manometry is a test done to evaluate the reflexes and the neurological and muscular portions of the rectum responsible for continence.


Fecal incontinence, constipation, assessment of neuromuscular components necessary for continence.


Some patients may experience rectal discomfort.

What to do the night before the procedure

Do not eat or drink anything six hours prior to your test.

Preparing for the procedure

You will do three Fleet® enemas (green & white box), 5 minutes apart, 1 hour prior to test. Please allow enough time to do the enemas, go to the bathroom and come to the Methodist Hospital Reflux Center. Performing anorectal manometry requires an alert and conscious patient. Local application of nitrates may affect pressure results, so follow your physician’s instructions regarding medications.

During the procedure

Following a digital rectal examination, a balloon-tipped rectal manometric catheter with pressure recording sites arranged circumferentially is positioned in the rectum with the patient in the left lateral decubitus position, and the internal and external sphincter pressure profile is measured. The patient is asked to voluntarily contract and relax the pelvic floor musculature. Rectoanal inhibitory reflex and rectal sensation thresholds are assessed with inflation of the balloon tip.

After the procedure

You may drive yourself home after the procedure.