08/14/2026
SIBO Testing: Lactulose vs. Glucose
SIBO breath testing may use different substrates depending on the clinical approach:
✨ Lactulose – travels through the digestive tract and can help detect gas production further along the small intestine, though results may be influenced by intestinal transit time.
✨ Glucose – is absorbed earlier in the small intestine, making it useful for detecting bacterial overgrowth in the upper small intestine.
✨ Lactulose + Glucose – some testing approaches use both to provide broader assessment of hydrogen and methane production.
The right test depends on your symptoms, history, and healthcare provider’s clinical assessment. Book an appointment at Revivelife today!