SIBO Test

A SIBO test, often called a hydrogen breath test, is a non-invasive way to detect small intestinal bacterial overgrowth (SIBO). This condition happens when bacteria multiply excessively in the small intestine, potentially causing a range of digestive symptoms and discomfort.
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What is a SIBO Test?

SIBO tests, most commonly performed as breath tests, are used to detect small intestinal bacterial overgrowth (SIBO) as well as malabsorption of sugars like lactose or fructose. Malabsorption occurs when the small intestine does not fully absorb certain food components, leading to digestive issues. These conditions can produce symptoms similar to acid reflux and may occur on their own or alongside GORD (Gastro-Oesophageal Reflux Disease). Identifying SIBO or malabsorption is important because, if left undiagnosed, patients may undergo unnecessary surgery—or, if surgery is performed, it may be less effective or cause side effects. For example, a patient with bloating caused by SIBO may find that a Nissen fundoplication procedure worsens this symptom rather than relieving it.
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What causes SIBO?

SIBO typically develops when the normal movement of food and bacteria through the digestive system is disrupted, creating an environment where bacteria can overgrow in the small intestine. Common causes include:

  • Motility disorders: Conditions that slow down the movement of food through the digestive system, such as irritable bowel syndrome (IBS) or nerve damage related to diabetes.
  • Structural issues: Problems like bowel surgery, scarring, or adhesions that disrupt the normal flow of food.
  • Immune system conditions: Health issues that affect immunity can alter the balance of gut bacteria.
  • Low stomach acid: Reduced stomach acid can decrease the stomach’s ability to kill bacteria before they reach the small intestine.
  • Medications: Long-term use of proton pump inhibitors (PPIs) or antibiotics can disrupt healthy gut flora.

Common Symptoms of SIBO

The symptoms of SIBO can differ based on how severe the condition is, but common signs include:
Bloating and excess gas
Abdominal discomfort
Diarrhoea or loose stools
Constipation
Nausea/ Feeling Full  
Unintentional weight loss
Fatigue or weakness
Nutritional deficiencies,
If SIBO goes untreated, it can result in long-term problems such as malnutrition and damage to the small intestine, so it’s important to seek medical advice if symptoms persist.

Our Testing Process

At Gut Diagnostics, SIBO can be diagnosed using non-invasive tests like hydrogen or methane breath tests, blood tests for nutritional deficiencies, or small intestine fluid analysis during endoscopy. Your consultant will review your results and medical history to create a personalised treatment plan, which may include antibiotics, dietary changes, probiotics, or addressing underlying conditions.
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Book your appointment

If you’ve been referred by your GP or another healthcare professional, you can book directly with us. If you don’t yet have a referral, our team can advise you on how to arrange one.

Attend your SIBO Test

To diagnose SIBO, you may undergo a hydrogen or methane breath test, where you drink a sugar solution and your breath is analysed for gases produced by bacteria in the small intestine. In some cases, a small fluid sample may be taken from your small intestine during an upper GI endoscopy to check bacterial levels, and blood tests can be done to assess nutritional deficiencies or inflammation. Your consultant will review all results alongside your medical history to ensure an accurate diagnosis.

Receive your results and personalised report

Within a few days, a consultant will carefully review your results and provide a detailed report. You’ll then have a follow-up consultation to discuss the findings, treatment options, or onward referrals if needed.

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"Excellent service from initial consultation through to my procedure."
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"A very useful experience everything explained well, no problems, pleasant Doctor."
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"My visit was well organised with a brief consultation and blood test."
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11 August 2025
"I am very pleased with every aspect of the treatment and care I received."
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25 July 2025
"I was worried coming in but everyone was very welcoming and made me relax and the procedure was much quicker than expected."
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25 June 2025
"Wonderful experience from start to finish. Everything was explained very clearly and reassuring."
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Throughout all this he has been very professional, friendly and extremely supportive. It all was a very positive experience. Thank you.
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"Professional, calm, and reassuring, explained everything clearly, and I didn’t feel a thing. Outstanding care throughout, I can highly recommend him."
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"Outstanding care throughout, I can highly recommend him."
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"I would definitely recommend and thank them for the care and attention"
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"Very personable and professional from the start and made me feel at ease immediately. He’s quickly got me through the process and I couldnt be more impressed."
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How much does a SIBO Test Cost?

Simple, transparent pricing with no hidden fees.
Paying for yourself
You don’t need private medical insurance to be treated at Gut Diagnostics. As a self-pay patient, you can access safe, high-quality healthcare at times that work best for you.

You don't need a referral from your GP or specialist. We provide comprehensive consultations to ensure the test is right for you. The self-pay route makes the process much simpler — there’s no need for insurance authorisation, and you’ll benefit from a wider choice of consultants and more flexible appointment times.
Paid by insurance
Gut Diagnostics is recognised by all major health insurance providers. If you have a personal policy, or cover arranged through your employer, you can use it to pay for your care — from your first consultation through to treatment, surgery, and aftercare such as physiotherapy.

As policies vary, it’s important to check with your insurance provider to confirm exactly what is included in your cover before starting treatment.

SIBO Test

Private SIBO Test at Gut Diagnostics costs £2,355
£2,355
INCLUDES
Your fee includes the procedure as well as:
Initial consultation
Personalised referral letter
Monitoring and support
High-resolution images
Comprehensive report
Priority scheduling
Treatment advice
Coordination with specialist
Follow-up consultation
Safe hospital environment
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Frequently asked questions

Everything you need to know about the product and billing.
What is a SIBO test and how does it work?
A SIBO test is a diagnostic tool used to detect small intestinal bacterial overgrowth. Most commonly, a hydrogen or methane breath test is used, where you drink a sugar solution and your breath is analysed for gases produced by bacteria in your small intestine.
What are the most common types of SIBO tests?
The main SIBO tests include hydrogen or methane breath tests, small intestine aspirate and culture during an upper GI endoscopy, and blood tests to check for nutritional deficiencies or inflammation.
How accurate are hydrogen and methane breath tests for SIBO?
Breath tests are non-invasive and widely used, but their accuracy can vary. They are generally reliable for detecting bacterial overgrowth when performed correctly and interpreted by a specialist.
Do SIBO tests require fasting or preparation?
Yes, most SIBO tests require fasting for several hours and avoiding certain foods or medications beforehand. Your healthcare provider will give clear instructions to ensure accurate results.
How long does it take to get results from a SIBO test?
Results from a breath test usually take a few hours to a day, while endoscopy-based tests may take a few days to one week. Blood test results depend on the lab processing time.
Are SIBO tests painful or invasive?
Breath tests are completely non-invasive and painless. Endoscopy-based tests are minimally invasive, typically performed under sedation, and blood tests require a simple blood draw.
Can SIBO tests detect other digestive conditions?
Yes, SIBO testing can sometimes highlight other issues such as malabsorption of sugars like lactose or fructose, which can cause similar digestive symptoms.
What happens after a positive SIBO test?
If SIBO is confirmed, your doctor will create a personalised treatment plan, which may include antibiotics, dietary changes, probiotics, and management of any underlying conditions to reduce bacterial overgrowth and prevent recurrence.

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At Gut Diagnostics, we are a dedicated team of gut health specialists, bringing together advanced diagnostics and compassionate care.

Our flagship clinic is proudly based at The Priory Hospital, a renowned centre of medical excellence. This prestigious setting provides our patients with access to state-of-the-art facilities, a safe and regulated environment, and the support of a leading multidisciplinary healthcare team.

Our specialists are here to guide you on your journey to better digestive health.
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