Anorectal physiology tests
You have been asked to attend this test for problems associated with faecal incontinence or constipation, or other bowel problems.
Your consultant has requested these tests so that they can establish what exactly is causing your particular problem. They can then offer the most appropriated treatment.
Anorectal physiology tests are used to assess the function of the muscles in your anal canal to see if they are working normally, and also checks the sensitivity of the rectum to small volumes of air and its response to distension.
This page outlines what to expect both during and after the test.
Upon arrival
- When you arrive you will be greeted and taken into a private room by the clinical scientist who will be performing the test.
- A chaperone will also be present to assist. The clinical scientist will ask you some questions about the symptoms you have been having and take a brief history. You will have the opportunity to ask questions or discuss any concerns you may have regarding the test.
- What does the test involve?
- You will be asked to undress from the waist down, put on a gown and lie, covered with a sheet, on your left side. Every effort will be made to preserve your privacy and dignity during the procedure.
- The clinical scientist will perform a gentle rectal examination and ask you to push and squeeze to check how your muscles are working.
- A thin, water-filled tube (catheter) with a small balloon on the end will then be put through the anus into the rectum. You will be asked to perform manoeuvres such as squeezing, pushing, and coughing to assess the functionality of the anal muscles. This catheter is approximately the width of a pencil.
- Next, the balloon on the end of the tube will be inflated with a very small amount of air, and you will be asked to comment on your sensations as this happens. This is the last part of the test.
- If your consultant has requested a treatment called “biofeedback”, the clinical scientist may show you the computer screen and talk you through techniques to improve the function of your anal muscles (but only if you need it). You may also be required to attend clinic on another day for further sessions of biofeedback.
Frequently asked questions
How shall I prepare for the test?
No special preparation is necessary. You may eat and drink as normal before and after the test and take any prescribed medications as normal.
Are there any risks associated with these tests?
The test may be a little uncomfortable but should not be painful.
There is a very small risk of perforation (piercing a hole somewhere in the anus or rectum with the tube). This is highly unlikely as the catheter used is small and smooth. The clinical scientist performing the test is also very experienced and has specialist training.
If you have a latex allergy, you will need to notify the department before your appointment – although all efforts are made to ensure the environment is already latex free.
If you have any further concerns please contact the GI physiology department on 0117 414 8801.
What happens after I have had the test?
The clinical scientist will explain the basic findings of your test and a report will be sent to your referring consultant. You may be asked to return for a follow up appointment, or a phone follow up may be arranged if required.
You will be able to resume normal activities following the tests. There is no sedation involved in the tests so you should be able to drive home immediately afterwards
How long does the test take?
The appointment is for an hour however the test itself usually takes approximately 20 minutes. This allows time for you to ask any questions you may have and for the clinical scientist to give you some advice to help improve your symptoms if necessary.
Are there any alternatives to the test?
There are no alternatives to these investigations. They are simple and minimally invasive.
What will happen after your tests?
You will be able to resume normal activities following the tests.
Further appointments
If you require any additional information concerning the investigations or any advice please contact us using the details below. If unavailable please leave a message and you will be contacted.
References and sources of additional information
Guts UK
This organisation is a registered charity that offers advice and information on digestive problems.
- Website: Guts UK - committed to fighting all digestive diseases
- Phone: 020 746 0341
- Email: info@gutscharity.org.uk
Bladder and Bowel Community
They help support millions of people who are living with conditions that affect their bladder or bowel.
© North Bristol NHS Trust. This edition published June 2024. Review due June 2027. NBT002923
Contact GI Physiology
Gate 36, Level 1,
Brunel building,
Southmead Hospital,
Bristol
BS10 5NB
Phone: 0117 414 8801
Email: GIphysiology@nbt.nhs.uk
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