Gut Testing Australia
Gut testing divides into two main approaches: stool-based analysis, which examines the microbiome, digestive function, and inflammatory markers from a collected sample, and breath testing, which measures gas produced by bacteria in the small intestine. These are distinct investigations that answer different questions – stool tests map the broader gut environment, while breath tests are specific to bacterial activity in the small intestine.
These tests are most commonly used by people working with a practitioner to investigate persistent digestive symptoms – bloating, altered bowel habits, or symptoms that have not resolved with straightforward dietary changes. In most cases, the appropriate test is guided by clinical context rather than personal preference.
Key principle: A useful starting point is to think about where the symptoms seem to be coming from. If bloating, gas and discomfort tend to occur soon after eating, particularly higher-fibre foods, a SIBO breath test may be more relevant because it looks specifically for bacterial overgrowth in the small intestine.
If symptoms are broader and include irregular bowel habits, food sensitivities, digestive discomfort, post-antibiotic changes, or a desire to better understand overall gut health a stool test such as GI-MAP or GI360 may provide more useful information (or you can do this and a SIBO test for a complete picture).
Gut testing products at Fairfield Nutrition
| Product | Brand | Best For | Key Details |
|---|---|---|---|
| Doctor’s Data GI 360 Test | Doctor’s Data | Comprehensive gut investigation | Stool-based; broad panel covering microbiome balance, digestion markers, inflammation indicators, and pathogens |
| Complete Microbiome GI-Map Test | Nutripath | At-home microbiome assessment | Stool-based; at-home collection; analyses bacteria, fungi, parasites, and immune markers across the full gut |
| Lactulose SIBO Breath Test | – | Small intestinal bacterial overgrowth assessment | Breath-based; lactulose substrate; measures hydrogen and methane gas production over a timed collection period |
How to choose between gut testing products
The primary decision is whether the clinical question points to the broader gut environment or specifically to bacterial activity in the small intestine.
- Comprehensive stool analysis: The GI 360 (Doctor’s Data) and GI-Map (Nutripath) both investigate the full gut microbiome, digestion function, and inflammatory markers via stool sample. The GI-Map uses at-home collection, which suits people who prefer convenience or cannot attend a clinic; the GI 360 covers a similarly broad panel and is often chosen based on practitioner preference or the specific markers their protocol requires.
- SIBO breath testing: The Lactulose SIBO Breath Test is a targeted investigation for bacterial overgrowth in the small intestine, using a breath-based method that is distinct from stool analysis. It is appropriate when symptoms and clinical assessment point specifically toward small intestinal involvement rather than a broader gut ecology question. SIBO symptoms can include bloating (particularly soon after eating), digestive discomfort, food reactivity (particularly to FODMAPs), and changes in bowel movements
Part of the Fairfield Framework
Understand
Testing sits mostly in the Understand stage. It helps clarify what may be happening before moving into more targeted support. In most cases, the sequence is:
| Stage | What it means for testing |
|---|---|
| Notice | Identify patterns in symptoms, triggers, timing, digestion, energy, sleep, or recovery. |
| Understand | Use testing when it can clarify the pattern and guide better next steps. |
| Support | Address foundations that influence the test result, such as food, sleep, stress, protein, fibre, and nutrient status. |
| Intervene | Use more targeted interventions only when the pattern is clear enough to justify them. |
Learn more about our Framework
If you are uncertain which test is appropriate for your situation, your practitioner is the most reliable guide – the right choice follows from your symptom history and clinical context, not from the tests themselves.
All gut testing products stocked at Fairfield Nutrition are shown below.
