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Small Intestine Bacterial Overgrowth Test

£188.00

It is now thought that small intestine bacterial overgrowth (SIBO) may be the underlying cause in many cases of IBS as well as of other digestive symptoms and chronic conditions.

SIBO is a condition in which bacteria that should be in the large intestine begin to overgrow in the small intestine. Once in the small intestine, these bacteria feed and multiply creating gases which can cause abdominal pain, bloating, flatulence, constipation, and diarrhoea.

The Small Intestine Bacterial Overgrowth Test works by measuring the production of hydrogen or methane gas after the ingestion of glucose or lactulose. If there is an overgrowth of bacteria in the small intestine, large quantities of fermentation gases will be produced and can be detected in a breath sample.

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Key Information

The Small Intestine Bacterial Overgrowth Test is recommended to those who:

  • Suffer from IBS, or an intolerance to fructose, sucrose, or lactose; especially if there is a lot of abdominal bloating and gas.
  • Have unexplained digestive symptoms as well as vague symptoms such as fatigue, headaches and joint pains.
  • Have one of the conditions above that may be aggravated by SIBO including:

    • Chronic pancreatitis
    • Fatigue
    • Nausea
    • Acid reflux
    • Acne rosacea
    • Skin rashes
    • Restless legs
    • Joint pain
    • Weight loss or gain
    • Food sensitivities
    • Incontinence
    • Headaches
    • Interstitial cystitis
    • Rheumatoid arthritis
    • Chronic fatigue syndrome
    • Fibromyalgia

The test works by measuring the production of hydrogen or methane gas after the ingestion of glucose or lactulose. If there is an overgrowth of bacteria in the small intestine, large quantities of fermentation gases will be produced and can be detected in a breath sample.

The lactulose test is most useful for diagnosing bacterial overgrowth at the end of the small intestine. This is commonly associated with constipation dominant IBS.

The glucose test is most effective for assessing bacterial overgrowth in the upper part of the small intestine. This is typically present in cases of diarrhoea dominant IBS

You will need to collect 10 breath samples collected over 3 hours.

Your sample needs to be sent using guaranteed next day delivery or via courier – (not included in price)

Wait a minimum of 2 weeks after antibiotics, colonoscopy or Barium studies before  undertaking the breath test.

One week prior to testing, please stop taking any herbal antimicrobials

One day prior to testing, please stop taking:

  • Non-prescription laxatives
  • Digestive aids such as enzymes or hydrochloric acid
  • Non-prescription antacids or acid blocking medications
  • Probiotics


The test requires the client to undertake a restrictive diet 24 hours prior to undertaking the test. It is broken down into 2 stages; 12 hours of controlled diet followed by 12 hours fasting. Full details are provided with the test kit.

Suitable for all ages, however children need to be competent in blowing into a balloon and we need to know the weight of your child so that we can advise about the correct amount of lactulose/glucose for the test.

  1. Order Your Test with an Optional Consultation
    We will be sent your results first and will then dispatch them to you. We offer a service to interpret your results and provide you with recommendations to improve any findings within them. This requires a consultation which can be added to your order at the time of booking.
  2. Collect Your Sample at Home
    Every test comes with clear instructions on how to collect your samples.
  3. Return Your Test
    Once you’ve collected your sample,

    Your sample needs to be sent using guaranteed next-day delivery or via courier – (not included in the price). Do not send on a Friday or over the weekend.

  4. Analysis and Result Interpretation
    Once processed, your results will be sent to us. We can then provide you with this information directly.
  5. Optional – Book a Consultation with Our Team
    Schedule a consultation with one of our team to discuss your results and develop a personalised treatment plan tailored to your needs. Our team will guide you through the findings and offer recommendations to target any of the finding in your test.
This Test is processed by Genova Diagnostics, by purchasing this product you are agreeing to their privacy policy

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