SIBO Breath Test - Glucose + Lactulose
What is a SIBO breath test?
Small intestinal bacterial overgrowth is associated with bloating that worsens through the day, excess gas, diarrhoea or constipation, nausea and fatigue. It is a commonly overlooked contributor to IBS-type symptoms.
This kit uses both glucose and lactulose substrates, collected at home over three hours, so you are not limited to one part of the small intestine.
A positive result is a marker, not a diagnosis. It tells you and your practitioner that overgrowth is likely and worth looking at alongside your symptoms and history.
What your results look like
Your results arrive in the i-screen dashboard as gas curves — hydrogen and methane plotted against time, with your baseline marked and the reference thresholds shown alongside.
Each substrate is charted separately, so you can see whether a rise appeared early or late in the three hours, and which gas drove it. That pattern is part of the interpretation, not just the yes/no result.
Results comes with a written interpretation from i-screen's in-house dietitian and suggested next steps.
What's included
Hydrogen and methane measured in parts per million at baseline, then at 30, 60, 90, 120, 150 and 180 minutes. Lactulose travels further along the small intestine than glucose, so it can pick up overgrowth lower down. Methane at about 10 ppm or above at any point is generally treated as positive; methane is produced by archaea rather than bacteria, and that pattern is termed intestinal methanogen overgrowth (IMO).
Hydrogen and methane measured in parts per million at baseline, then at 30, 60, 90, 120, 150 and 180 minutes. Glucose is absorbed quickly, so a rise points to overgrowth higher in the small intestine, closer to the stomach. A hydrogen rise of about 20 ppm above baseline by 90 minutes is the threshold commonly used to flag bacterial overgrowth.
Test instructions
Your finger prick test kit and all instructions are posted directly to you, and there is no need to visit a collection centre.
Mail your sample back to the lab using the prepaid envelope and packaging.
Ready. Set. Go!
Buy now for £160
Common Questions
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