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Dr. Harsh J Shah

How Is Rectal Prolapse Checked? Tests and Defecography

Last updated: 04-Nov-2026

Dr Harsh Shah, GI surgeon, Ahmedabad

Dr Harsh Shah
MS, MCh (Surgical Gastroenterology), DrNB (Surgical Gastroenterology)
Registered with Gujarat Medical Council, Reg. No. G-38738
GI & Proctology Surgeon
Dr. Jivraj Mehta Hospital, Vasna, Ahmedabad · 18 years of experience

In short

The check has one job: to turn the words “something comes down” or “I cannot empty” into a clear plan. Your story and an examination do most of the work.

Defecography, a moving X-ray or MRI taken while you strain, shows hidden prolapse and how the pelvic floor behaves. It is used when the story or examination leaves a question.

A scope of the bowel is part of the check, because bleeding or a growth can pass for prolapse. Pressure tests and an ultrasound are added only for leakage or blocked emptying.

The full picture of rectal prolapse and its treatment is on our rectal prolapse surgery page. This post explains how the problem is checked, step by step.

What does the doctor ask first?

Three different stories hide under one complaint. The doctor asks which one troubles you most, because the main symptom changes the plan more than any scan does.

The three stories the doctor listens for
Main troubleWhat we ask aboutWhere it leads
Something comes downA lump when you strain or walk, pushing it back, mucus, bleeding, a feeling of sitting on a ballExamination, then the choice of repair
Cannot emptyStraining, a blocked feeling, pressing on the vagina or near the anus to help, long time on the toiletDefecography and exercise training for the pelvic floor
Leaking stool or gasSoiling without warning, or a rush you cannot hold, pad use, night leaksPressure tests and an ultrasound of the anal muscles

Most people have a mix of these. Tell us which one you would fix first if you could.

Which answers change the plan?

A few details matter more than the rest. They tell us whether to test further, whether to try exercise first, and whether the cause may be something more serious.

  • Pressing on the vagina to empty suggests a bulge of the rectum into the vagina.
  • Pressing near the anus to empty suggests a fold of the rectum that blocks the way out.
  • Life-long straining, and a feeling of pushing against a closed door, suggest a pelvic floor that tightens instead of relaxing.
  • Bleeding, mucus and a constant urge to go, in a young person who strains, may point to a sore on the front wall of the rectum.
  • Leaking that began after the prolapse began suggests a stretched anal muscle and nerve.
  • Weight loss, a changed bowel habit or low blood count need a scope before anything else.

What happens at the examination?

The examination is the most useful test. It often settles the diagnosis. For an older, frail person with an obvious prolapse, it may be all that is needed.

Steps of the examination and what each shows
StepWhat it shows
Looking at restA loose anus, skin change, a prolapse already out, a pelvic floor that sags
Straining, lying on your sideMay bring the prolapse out so we can see it
Straining while seated on a commodeMany prolapses come out only upright, and are missed on the couch
Looking at the foldsRings all the way round, with a groove, mean the full wall. Folds like spokes mean the lining or piles
Finger examination at rest and squeezingThe strength of the anal muscles
Finger examination while you bear downA tightening instead of a relaxing shows the muscle is working against you
Finger in the rectum and vagina together, in womenSize of a bulge into the vagina, and any bowel slipping down behind it
Pushing the prolapse backWhether it can go back. A mass that will not, turns dark or is sore needs care the same day
Short scope of the anal canalA sore or a polyp on the front wall, which is sampled if there is doubt

If the prolapse will not come out in the clinic, that does not mean it is not there. A photograph taken at home, or defecography, can show it.

What is defecography and when is it used?

Defecography is a moving picture of the rectum and pelvic floor taken while you pass a soft paste. It shows what happens in a real effort that a couch examination cannot copy.

  • A soft paste is placed in the rectum. You sit on a special seat, strain and empty while pictures are taken.
  • It shows a hidden fold of bowel and a bulge towards the vagina. It shows bowel slipping down behind it, and how far the pelvic floor drops.
  • It also shows if the muscle that should open the passage stays shut.
  • An X-ray version uses a small dose of radiation. An MRI version uses none and also shows the bladder and the womb in the same study.
  • It is most useful when emptying is the main trouble. It also helps when the prolapse is hidden, or a repair through the abdomen is planned.

It is private and short. It is not usually sore. Let the team know if you feel shy or anxious, and we will help you through it.

How do doctors read the pictures?

The pictures are read against a short checklist. The grade of the hidden fold is the key finding, but the grade alone never decides an operation.

What defecography reports and why it matters
FindingWhat it meansEffect on the plan
Hidden fold, grade one to fiveHow far the folded rectum travels, from inside the rectum to out through the anusHigher grades with matching symptoms may need an operation
Bulge towards the vaginaIts depth, and whether paste gets trapped in itRepaired only when it is large, traps paste and you press to empty
Bowel in the space behind the vaginaSmall bowel or sigmoid colon slips downFavours an operation through the abdomen
Drop of the pelvic floorThe pelvic floor sags below its normal levelPoints to wide weakness of the floor
Muscle that stays shutThe passage fails to open when you pushExercise training comes before surgery
How much emptiesAmount and speed of emptyingPoor emptying points to a blocked outlet

The grade guides us, but your symptoms decide. A high grade in a person with no trouble is often left alone.

Which other tests may be added?

No single test answers everything. Each one answers one question. We choose by your main trouble, and skip tests that cannot change the plan.

  1. A scope of the bowel is done in almost everyone. It rules out a growth, a polyp or a sore before the problem is called benign.
  2. A pressure test of the anus measures squeeze, rest tone and rectal sensation. It is used for leakage and blocked emptying.
  3. A balloon test checks if you can expel a small balloon. It is a simple screen for muscles that fail to relax.
  4. An ultrasound from inside the anal canal maps tears in the anal muscle. It is used before any muscle repair.
  5. A transit study with markers shows if the whole colon is slow. It stops us offering a repair to someone whose real problem is a slow colon.

Two points are not optional. A scope comes first when there is bleeding, weight loss or older age. And a person with a slow colon should not be told that a prolapse repair will ease constipation. It will not.

How does the plan follow from the results?

The tests lead to one of a few routes. An obvious prolapse in a frail person goes straight to a scope and surgery planning. Blocked emptying goes to exercise training first.

  • A clear full prolapse in a fit person: scope, then imaging, then planning a repair through the abdomen or the perineum.
  • A clear full prolapse in a frail person: scope, then a smaller repair through the perineum, often without further scans.
  • Blocked emptying with a muscle that stays shut: biofeedback exercise training before any operation.
  • Leaking with a torn anal muscle: the muscle repair route.
  • Leaking with an intact muscle: exercises, medicine and bowel training, and nerve stimulation if these fail.

Scores for leakage and for emptying are noted at the first visit. They give a baseline, so we can check later how much you have truly improved.

Frequently asked questions

Do I need defecography for rectal prolapse?

Not always. If the bowel clearly comes out and the examination shows it, scans may add little. Defecography helps when the prolapse is hidden, or when emptying is the main trouble.

What is defecography?

It is a moving X-ray or MRI taken while you pass a paste placed in the rectum. It shows how the bowel and the pelvic floor behave when you strain.

Is defecography embarrassing or painful?

It is private, and the team does this all day. It does not usually hurt. Most people find the nervous wait harder than the test.

Why do I need a colonoscopy if I only have prolapse?

A growth or polyp can sit at the tip of a prolapse, and bleeding has other causes. The scope rules these out before the problem is called benign.

What if the prolapse will not come out in the clinic?

That is common. We may ask you to strain on a commode, or to photograph it at home. Or we arrange defecography, which copies a real toilet effort.

What is the pressure test of the anus?

A thin tube measures how tightly the anal muscles squeeze and relax, and how well you sense a filling rectum. It helps in leakage and in blocked emptying.

Will the tests decide my operation?

They guide it. Your main symptom decides most. A picture with no complaint is often left alone, and some people need exercise training before any operation.

Related pages

For the whole range of prolapse care, start at the rectal prolapse surgery page. For questions before you travel, call +91-63555-64601.

Where Dr Harsh Shah sees patients and operates

Dr Harsh Shah — Dr. Jivraj Mehta Hospital, Vasna, Ahmedabad
Dr. Jivraj Mehta Hospital, Dr Jivraj Mehta Marg, Vasna, Ahmedabad 380007.
Consultations, review of reports and scans, operations and follow-up. OPD Monday to Saturday, 9 am to 5 pm.
Appointments: +91-63555-64601 · +91-63590-11009 · Hospital 079-2663 6363
Directions to the hospital · WhatsApp +91-63555-64601

Something comes down when you strain, or you cannot empty your bowel fully? You do not need to work out the test yourself. Dr Harsh Shah takes the history, examines you and orders only the tests that will change your plan. Call, or send a message on WhatsApp. Call +91-63555-64601 Ask on WhatsApp

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Dr. Harsh J Shah
Dr Harsh Shah, Gastro, Cancer & Laparoscopic Surgeon, Ahmedabad
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