Why does Anorectal manometry happen?
Last updated September 7, 2026.
Anorectal manometry happens because your care team needs to measure how the muscles and nerves of your rectum and anus work, which an exam or a scope cannot show. The usual reasons are constipation that has not improved with fiber, fluids, and laxatives, stool leakage, or pelvic floor muscles that squeeze when they should relax. A soft catheter with a small balloon records resting pressure, squeeze strength, how well you push, and how much stool volume you can feel. It is also used before some rectal surgery, after childbirth injury to the anal sphincter, and in children when a nerve problem such as Hirschsprung disease is being ruled out. The test takes about 30 to 45 minutes, you stay awake, and most people feel pressure rather than pain. Bring a symptom log covering stool form, frequency, straining, and leakage, since your answers shape how the results are read.
What to do
- Ask what question it answers: Have your doctor name the specific finding they are looking for, such as poor squeeze strength or muscles that fail to relax.
- Follow the prep exactly: Most centers ask for an enema one to two hours before, and you should confirm which of your medicines to pause instead of stopping any on your own.
- Bring a symptom log: Record stool form, frequency, straining, leakage, and laxative use for two weeks so the pressures can be matched to real symptoms.
- Expect an awake test: It runs about 30 to 45 minutes with no sedation, so you can drive yourself home and eat normally afterward.
- Plan the follow-up: Ask who reviews the report and whether pelvic floor biofeedback or physical therapy is the next step.
- See a clinician promptly for red flags: Rectal bleeding, unexplained weight loss, or a new lasting change in bowel habits needs evaluation before or alongside this test.