SIBO (GIT) Breath Test - Glucose + Lactulose

$360.00
$360.00
Shipping calculated at checkout.
A non-invasive at-home breath test that assesses for Small Intestinal Bacterial Overgrowth (SIBO) by measuring hydrogen (H₂) and methane (CH₄) gases your microbes produce after you drink a test sugar (lactulose or glucose). Timed breath samples create a gas-over-time curve that helps your clinician confirm or rule out SIBO patterns and guide targeted care.
  • Home collection kit —with substrate (lactulose and glucose), labelled tubes, mouthpiece and instructions.
  • Laboratory analysis — timed collection graph
  • Comprehensive Laboratory Report and a condensed plain-english summary
See Sample Report
  • Gas patterns over time: Rise in hydrogen by ≥20 ppm within 90 minutes suggests SIBO; methane ≥10 ppm at any time indicates methane-positive breath test (often termed IMO). Combined gas rise can indicate severity.
  • Sampling quality: CO₂ is measured to check for room-air contamination so results are reliable.
  • Clinical context: Choice of substrate (glucose vs lactulose) and the typical oro-caecal transit (~90 min) inform interpretation alongside symptoms and history.
  1. Order — Place your order; we register your kit with the lab.
  2. Shipped — Test is shipped direct to your preferred address.
  3. Collect at home — Follow the kit’s collection instructions. No clinic visit required.
  4. Return — Seal everything in the pre-paid materials and follow return instructions using included express return satchel.
  5. Review — When results are in, we'll notify you so you can book a consult with one of our doctors.
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  • Turnaround: Results take 7-10 business days
  • Who receives them: The Microbiome Clinic™ will email you & your GP the results from NutriPATH
  • Who analyses the sample: NutriPATH, an accredited medical laboratory (NATA ISO 15189; CLIA).
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How it works

Your test is send directly to you — Instructions & express reply postage sleeve are included.

Follow the included instructions, complete the test & use the pre-filled return sleeve to mail the test to the lab.

Results are emailed to you within 7-10 business days.

My Results

The SIBO Breath Test provides a non-invasive assessment of small intestinal bacterial overgrowth by measuring hydrogen and methane produced following a glucose or lactulose substrate challenge, enabling detection of hydrogen-, methane-, or mixed-gas patterns consistent with overgrowth.

This advanced testing method offers clinicians valuable insights for patients with IBS-type symptoms and motility or malabsorption issues, and is supplied through NutriPATH within our diagnostic offering, supporting precise diagnosis and targeted management of SIBO and related gastrointestinal disorders.

NutriPATH Report
A time-series graph and table of hydrogen and methane, explicit positive thresholds, and an interpretation summary.
Summarised Report
The Microbiome Shop™ prepares a more digestible report to help make sense of the medical terminology.
See Sample Report

Common Questions

7 - 10 business days. Once we are sent them, we will email you and you will be able to book a consult with one of our doctors to discuss your results and build a personalised microbiome repair program.

Well-suited for people with persistent bloating, abdominal pain, excessive gas, alternating diarrhoea/constipation, or predominantly constipation with “slow gut,” as well as those with IBS-like symptoms that haven’t responded to diet changes alone. It’s also helpful if your doctor suspects small-bowel overgrowth after antibiotic use, food poisoning, or long-term PPI use, or when methane-related patterns (often linked with constipation) are suspected and a tailored plan is needed.

The SIBO Breath Test provides insight into the microbial ecosystem in you mouth, helping identify causes of:

  • Bloating that worsens after meals
  • Excessive belching or flatulence
  • Abdominal discomfort/cramping
  • Diarrhoea, loose stools or urgency
  • Constipation, incomplete emptying, “slow gut”
  • Nausea, early fullness, reflux-like symptoms
  • Food intolerance patterns (e.g., reacting to fermentable carbs)
  • Unexplained fatigue or brain fog with gut symptoms