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SIBO Breath Test (Lactulose)
£195.00
The SIBO (Small Intestinal Bacterial Overgrowth) Lactulose Test is a non-invasive breath test designed to detect bacterial overgrowth in the small intestine, a condition that is often linked to digestive disorders such as irritable bowel syndrome (IBS).
Sample type: Breath (home collection)
Turnaround time: 7-10 working days
The SIBO Breath Test (Lactulose) is a simple, non-invasive test that measures gases produced by bacteria in the small intestine to detect Small Intestinal Bacterial Overgrowth (SIBO). This condition occurs when bacteria normally confined to the large intestine overgrow in the small intestine, interfering with digestion and nutrient absorption.
By analysing hydrogen and methane gases in your breath after consuming a lactulose solution, this test provides accurate information about bacterial activity in the small intestine. Results can help explain persistent digestive issues and guide a personalised treatment plan.
What the test measures:
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Hydrogen and methane gas production – Markers of bacterial fermentation in the small intestine
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Timing and patterns of gas release – To distinguish between normal digestion and SIBO
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Severity of bacterial overgrowth – Insight into the extent of imbalance
- Order your preferred test
- Receive your kit via post with full collection instructions
- Collect your sample at home and return to lab using provided packaging
- Receive your results once they have been processed by the lab
- If you want an in-depth review of your results to understand the findings, book a Lab Test Results Consultation
- If you would like a personalised Nutrition & Lifestyle Action Plan based on your findings, book an Initial Consultation
- Need help choosing a test? Contact us, or book a free 15-minute Discovery Call with our team
SIBO has been linked to a wide range of digestive and systemic symptoms, including:
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Bloating and abdominal distension
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Excessive gas and belching
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Abdominal pain and cramping
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Diarrhoea, constipation, or alternating bowel habits
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Heartburn and indigestion
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Nutrient deficiencies and malabsorption
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Fatigue and brain fog
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Worsening of conditions such as IBS, fibromyalgia, or chronic fatigue syndrome
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Persistent bloating and excessive gas
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Abdominal pain or discomfort
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Irregular bowel habits – diarrhoea, constipation, or alternating patterns commonly seen in IBS
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Suspected imbalances in the gut microbiome contributing to chronic digestive symptoms
The test is appropriate for most individuals, including those with diabetes, as lactulose does not cause significant changes in blood sugar levels. It is ideal for those seeking a thorough understanding of their digestive health within a functional medicine framework.
Why choose this test?
The SIBO Breath Test (Lactulose) is a safe and effective way to uncover bacterial overgrowth in the small intestine — one of the most common yet underdiagnosed causes of chronic digestive symptoms. With expert analysis and a personalised interpretation report, this test provides a clear path toward targeted dietary strategies, supplementation, and treatment to restore digestive balance and long-term health.
Frequently Asked Questions
Hydrogen-dominant SIBO is typically associated with diarrhoea, while methane-dominant SIBO (now often referred to as IMO – Intestinal Methanogen Overgrowth) is linked to constipation. This test measures both gases, helping to pinpoint the type of overgrowth and guide tailored treatment strategies.
Preparation usually includes following a specific diet the day before and fasting overnight. You’ll also need to avoid certain medications or supplements that could affect the results. Full instructions are provided with the kit to ensure accuracy.
If your results are positive, our practitioners can develop a personalised plan that may include antimicrobial or herbal treatments, dietary modifications (such as a low FODMAP approach), and support for gut motility to help rebalance your microbiome and prevent recurrence.
What Our Customers Say
“This test was exactly what I needed to understand the cause of my symptoms. It explained my constant bloating and finally allowed me to get my gut health on the right track, eating the right foods and taking the right supplements to address my SIBO.”
– Max D
“Simple to use at home and very accurate. I was surprised to learn I had methane-dominant SIBO which highly influenced how my practitioner Carmen approached my treatment afterwards.”
– Bradley P
“Highly recommend if you’ve been dealing with IBS symptoms that come and go. This test gave me answers where others failed.”
– Nicola A
