This page gives you information about transrectal ultrasound of the urethra (TRUS-U) scan and what to expect before, during and after your appointment. If you have additional questions, please contact your clinical team.
A TRUS-U is a type of ultrasound scan. It uses sound waves to create pictures and assess the area surrounding the urethra (the tube that connects between the bladder and the outside of the body) and vagina. It is performed with an ultrasound probe inserted a short distance into the rectum (back passage).
TRUS-U is used to visualise gynaecological meshes and assess for related complications. It is used in conjunction with MRI to assess the presence and status of mesh.
Within the radiology department at UCLH we have the most experience with this method of scanning and believe it provides the clearest images and most useful information for the clinicians.
A TRUS-U is safe. Radiation is not used. The scan may be uncomfortable but shouldn’t be painful. We do not routinely use sedation or any other medication prior to or during the scan.
If you decide not to have a TRUS-U we may not be able to fully assess the condition of the mesh. There are alternative scans, but they may miss important details.
Transvaginal ultrasound (when the ultrasound probe is placed in the vagina) provides similar information but the combination of appropriate equipment and experience in performing this study is not available at UCLH at present.
A translabial ultrasound (probe placed on the vulva, outside the body) may be used but our experience is that this provides less detailed images than TRUS-U.
MRI pelvis and TRUS-U together allow for a complete assessment. MRI alone is possible but is significantly less sensitive for some of the most common mesh related complications.
There are no special requirements to prepare for this scan. Continue to take your usual medication unless your doctor has asked you to stop. You should allow 1 hour for your appointment. If you need a hoist, (piece of medical equipment to help lift or move you safely) or transport, please contact the radiology department before your appointment.
We will start your appointment by re-explaining the scan and asking you whether you are happy to proceed. As is the case with any scan we perform. if you wish to stop the study for any reason you only need to say so, and we will stop immediately.
- The scan is performed by a specialist radiologist.
- A female chaperone is always present.
- You will be asked to lie on your left side with knees bent.
- Room lights may be dimmed to see images clearly.
- A small, thin probe (about 1.5 cm wide) is gently inserted into your back passage. The probe will only be inserted a few centimeters inside the back passage with lubricating jelly applied to the probe.
- The probe will be moved slightly so we can get the necessary images.
- Once the scan is completed, we will give you tissue to wipe away the gel and you can put your clothes back on.
Please inform the team of a latex allergy. The scan normally takes around 5-10 minutes but can take longer depending on individual cases.
You can go home after your TRUS-U and carry on with your normal activities. Your radiologist may discuss some results during or after your scan however this is not always possible. Your scan will be reviewed and then reported. The results will be sent back to your doctor and will be discussed at the multidisciplinary team meeting.
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Page last updated: 13 February 2026
Review due: 01 January 2028