Rectal examination under anaesthetic (EUA)

What is a rectal EUA, and is it a surgery?

A rectal EUA, sometimes called EUA surgery or rectal examination under general anaesthetic, is a short procedure that allows your consultant to examine the rectum and anal canal thoroughly while your muscles are relaxed. Although it’s not surgery in the traditional sense, rectal EUA is performed in an operating theatre under general anaesthetic and may include minor treatments or biopsies.

What is a rectal EUA used to diagnose or treat?

A rectal EUA is used to investigate symptoms such as severe pain, bleeding, lumps, discharge or changes in bowel habits. It can help diagnose or treat conditions including haemorrhoids, anal fissures, abscesses, fistulas, polyps, Crohn’s disease, cancer and other rectal or anal canal problems.

Rectal and anal conditions are common in the UK and can affect people of any age. They are often linked to constipation, straining, inflammatory bowel disease, infections, childbirth, ageing or a family history of bowel conditions.

How do I know if I need a rectal EUA?

Your consultant may recommend a rectal EUA if:

• An outpatient rectal examination is too painful
• Your symptoms suggest a condition that needs closer inspection
• A biopsy is required
• A minor treatment (such as drainage of an abscess) may be needed
• Previous tests (such as sigmoidoscopy) were inconclusive.

You may also need an EUA if your consultant suspects a condition that cannot be assessed fully while you are awake.

Who is suitable for a rectal EUA?

Most adults are suitable for an EUA and it’s generally safe, even for older adults.

You may still be able to have an EUA if you are pregnant, but your consultant will weigh the benefits and risks and may delay the procedure unless it’s urgent.

Who is not suitable?

You may not be suitable if you have:

• Severe heart or lung conditions that make general anaesthetic unsafe
• An active infection that needs treating first
• Certain bleeding disorders.

Your consultant will discuss this with you.

What are the alternatives to a rectal EUA?

Alternative options depend on your symptoms and may include:

• Outpatient rectal examination: Examination isn’t as thorough as rectal EUA and general anaesthetic isn’t required.
• MRI scan: Useful for fistulas, abscesses and deep pelvic problems.
• Endoanal ultrasound: Used for sphincter injuries or anal canal abnormalities.
• Flexible sigmoidoscopy or colonoscopy: To examine the bowel internally.

However, these tests may not replace an EUA if your consultant needs to examine the area closely or perform a biopsy or treatment at the same time.

How should I prepare for a rectal EUA?

Bowel preparation
You may be asked to take a laxative or use an enema (injecting liquid directly into your rectum) before the procedure to clear the lower bowel. Your consultant will give you specific instructions.

Eating and drinking
You will usually need to stop eating 6 hours before the procedure and stop drinking 2 hours before. Your pre‑operative team will confirm the exact timings.

Medication
Tell your healthcare team about all medications you take, including blood thinners, supplements and herbal remedies. You may need to stop some medications temporarily.

Pre‑operative assessment
You will attend a pre‑operative assessment where the team will:

• Review your medical history
• Check your blood pressure and general health
• Discuss your anaesthetic
• Explain what will happen on the day.

What to bring

• Comfortable clothing
• A list of medications
• Any relevant letters or test results.

What happens during a rectal EUA?

A rectal EUA is usually performed under general anaesthetic and typically takes 10–20 minutes, depending on whether any treatment is needed.

During the EUA:

• You will lie on your side while your consultant gently examines your rectum and anal canal.
• They may use a small instrument to view the area more clearly.
• If needed, they may take a biopsy.
• Minor treatments – such as draining an abscess, treating a fissure or banding a haemorrhoid – may be carried out at the same time.
• You may have a breathing tube during the procedure, depending on the type of anaesthetic used.

The procedure is not painful, as you will be asleep throughout.

What happens after a rectal EUA?

After the procedure
You will wake up in the recovery area before returning to your room. You may feel groggy, light‑headed or slightly bloated – this is normal and settles quickly.

Most patients go home the same day.

Going home
For the first 24 hours:

• Someone must take you home and stay with you
• Do not drive, operate machinery or cook
• Avoid alcohol and signing legal documents.

Returning to normal activities

• Most patients return to work the next day
• You can resume gentle exercise after 24–48 hours
• Avoid strenuous activity for a few days
• You can eat and drink normally once you feel well, but start with light meals.

Results
If a biopsy was taken, results are usually available within 1–2 weeks. Your consultant will explain how you will receive them.

What are the risks and possible complications of a rectal EUA?

A rectal EUA is generally very safe. Complications are uncommon but may include:

• Light bleeding, especially if a biopsy was taken
• Pain or discomfort, which is usually mild
• Feeling faint or light‑headed
• Infection: Rare, but may require antibiotics
• Anaesthetic‑related risks, your anaesthetist will discuss these with you.

Signs of complications
Seek medical advice if you experience:

• Heavy bleeding
• Severe or worsening pain
• Fever or chills
• Difficulty passing urine
• Persistent vomiting
• Signs of infection.

How much does a rectal EUA cost at Nuffield Health?

For pricing information, please contact your local hospital.