Hydrogen & Methane Breath Test

What is Small Intestinal Bacterial Overgrowth?

Small Intestinal Bacterial Overgrowth (SIBO) occurs when there is too much bacteria in the small intestine. The bacteria interfere with digestion and absorption and can result in digestive and secondary symptoms, malabsorption, and nutritient deficiencies. The bacteria produce gases such as hydrogen, methane and carbon dioxide. These gases can cause symptoms similar to those of Irritable Bowel Syndrome (IBS). Some studies have shown that up to 80% of people with IBS have SIBO.

The SIBO test can be done either in one of our clinic locations or the test can be perfomed at home using a home testing kit.

€165.00 (home test)


€170 (clinic test)

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book an appointment at one of our clinics in Kildare, Dublin or Galway

Test Duration: 2-3 hours

Testing Age: 16 years and above

Referral: No referral required

Results: Approx. 3-4 working days

Initial Clinic Test Fee: €170

Repeat Clinic Test Fee: €150 (within 12 months)


Some people may experience one symptom, while others may suffer from a combination of symptoms.

The most common symptoms reported include:



Diarrhoea and/or constipation, altered bowel habit

Abdominal distension

Fatigue (SIBO can utilise Vitamin B12)

Flatulence and/or belching

Food intolerances

Other symptoms reported include reflux, joint pain, acne rosacea, brain fog, intestinal cramps, intestinal gurgling, weight loss/weight gain, fullness, loss of appetite, anxiety.


  • Last (Covid) year was an extremely difficult one for me dealing with a number of severe Gastric problems and procedures. I realised early on that to heal I needed to take my own health into my own hands, and also realised the link between good gut health and general wellbeing. Having a positive test for SIBO allowed me to start the journey of repairing my gut microbe. I can highly recommend the many tests that Gastrolife offer, in an effort to live a well-balanced and healthy life. GastrolLife was the most important catalyst in taking responsibility for my own physical wellbeing.
    Brent Pope Rugby Pundit
  • The service provided at Gastrolife is fantastic. I carried out a SIBO test there, and tested positive. After years of digestive issues, I am now finally on the mend after identifying the correct treatment. This has given me great relief. Melissa is a wealth of knowledge and is really at the cutting edge of science in diagnosing and treating digestive issues. The team in Gastrolife is always efficient, professional and very friendly, and I would highly recommend them. 
    Damien Co. Clare
  • I decided to take the SIBO breath test with Gastrolife after suffering with IBS for more than 10 years. Melissa and all the staff were very knowledgeable and the test itself was very simple. I am glad I did, because the results were positive. My Gastroenterologist has since treated the SIBO and I am doing a lot better.
    Conor Co. Kildare
  • I want to take this opportunity to say thank you to Gastrolife for the changes this test has made to my life. I first heard of this Test through my Dietitian. I had struggled with my symptom’s for over three years before I took the SIBO test.. Following treatment, the positive change in how I felt were quite amazing. Thank you Melissa for the part you played in conducting the Gastrolife Tests without which I feel I could still be going around in circles looking for answers 
    June Co. Galway
  • I attended the Gastrolife clinic twice for breath testing. I was really impressed by their all around efficiency from my appointment, consultation and follow up. All instructions were clearly explained to me on line and by phone if I needed. The website is user friendly and I received my report and receipt promptly on time. 
    Grace Co. Dublin
  • The test is well organised and managed. Everything is clearly explained and Melissa puts you at ease throughout the process. There is a lot of time available to do the test so you can choose the most convenient.
    Veronica Co. Dublin
  • My experience in Gastrolife clinic couldn't have been better. Without needing a doctor's referral, Gastrolife's tests helped me to identify the root cause of many years of gut issues and discomfort. The staff are very professional and knowledgeable. Since then I have been on a path to recovery.
    Alan Co. Kildare