Cancer services

Capsule test

A simple test to detect early changes in your oesophagus (food pipe) for people with long-term acid reflux or heartburn symptoms.

What is the capsule test?

The capsule sponge is a quick, simple and safe way to collect cells from your oesophagus (food pipe). It helps doctors detect conditions such as Barretts oesophagus, which can increase the risk of cancer if not monitored. The test takes around 10 minutes and is carried out by a trained nurse.

Why have I been offered this test?

Your doctor or nurse may recommend the capsule sponge test if you:

  • have long-term heartburn, reflux or indigestion
  • need a check for Barretts oesophagus
  • want to avoid a more invasive procedure like an endoscopy and are at risk of oesophageal cancer, taking part may reduce the risk.

Benefits include

  • Quick and easy procedure.
  • No sedation required.
  • Early detection of changes in oesophagus.

What happens during the test?

  1. You will swallow a small capsule attached to a thin string.
  2. After 5 to 7 minutes, the capsule dissolves and releases a soft sponge.
  3. The nurse gently pulls the string back up – it collect a sample of cells.
  4. The sample is sent to the lab for testing.
  5. Most people describe it as slightly uncomfortable but not painful.

Before your appointment

  • Do not eat or drink for at least 4 hours beforehand.
  • Tell your nurse if you:
    • have trouble swallowing
    • take blood-thinning medication
    • have any allergies or bleeding disorders.

After your test

  • You can eat and drink like you normally do.
  • You might feel a mild sore throat for a few hours.
  • Results are usually available within a few weeks.

Are there any risks?

  • Mild throat discomfort.
  • Small chance of minor bleeding or gagging.
  • Serious complications are very rare.

After your clinic visit, you’ll get information that explains what happens next and advises if you get any problems.