Self-referrals 2018-04-19T17:30:13+00:00


The Functional Gut Clinic is now accepting self-referrals (self-pay patients only) for Hydrogen and Methane Breath Testing. Breath tests can be used to help in the diagnosis of conditions which may be causing or contributing to your abdominal (tummy) symptoms. We can use Hydrogen and Methane Breath Testing to help diagnose:

  • Small intestinal bacterial overgrowth: A condition where gut bacteria overpopulate the small intestine. These bacteria can ferment ingested food and drink, producing waste products that can cause troublesome symptoms of bloating, altered bowel habits, flatulence and abdominal discomfort.

  • Lactose Malabsorption: Lactose is the sugar found in milk and dairy products. Lactose malabsorption is a condition where the enzyme lactase, which breaks down the sugar lactose, becomes depleted in the small bowel. If lactase is depleted this process will be impaired leading to fermentation of lactose in the colon which in many individuals may cause abdominal discomfort, altered bowel habits, bloating and flatulence.


  • Fructose Malabsorption: Fructose is a naturally occurring sugar found in many plants and fruits. In some individuals, this sugar is not completely broken down and absorbed in the small intestine, reaching the colon. Fructose is highly fermentable in the colon and the by products of this fermentation can cause symptoms of abdominal discomfort, altered bowel habits, bloating and flatulence.

If you would like to self-refer for any of the above breath tests:

Step 1: Email or post with details of their clinical condition and the test they would like performed. The request will be triaged by our clinical staff and we will contact you if we need more information or if we think the test is inappropriate.

Step 2: A member of our admin team will contact you to arrange an appointment that suits you. You will be given information on how to prepare for the test and what the investigations involves.

Step 3: Attend for your breath test.


Please Note: Self-referrals can speed up the diagnostic process and if you need a referral to discuss the results with a Doctor, we can also arrange this for you to make sure that in addition to a firm diagnosis you can then receive appropriate treatment from an expert Consultant or Dietitian.

If you have any queries or questions then please email us at

You should explain to your GP that you are having digestive symptoms and would like to test the possibility that you may have small intestinal bacterial overgrowth or lactose / fructose intolerance. A downloadable information sheet is here (Patient History Form) which can be taken with you when seeing your GP.

Patients for hydrogen methane breath testing can either attend either our clinic in London, Manchester or alternatively can perform the test at home via a postal breath test kit. Full instructions on how to perform the home test will be provided and telephone support given. A video showing how we do a breath test can be seen below.

Results are emailed, faxed or posted to both the referring consultant / GP and the patient.


Monday – Friday8:30 – 17:30

+44 (0) 207 486 7777



Patient History Form

Please download your Patient/s History form below; before completing and returning it to:


Hydrogen Breath Test Patient Information

Click to download your Hydrogen Breath Test information sheet; containing any additional information you may need.

Contact Us

Please call us now on +44 (0) 207 486 7777.

You can email us at: