As a naturopathic doctor, I believe in taking a holistic approach to your health, especially when it comes to digestive issues.
If you’re struggling with symptoms like bloating, gas, constipation, diarrhea, abdominal pain, heartburn, or unexplained fatigue, it’s important to get to the root cause of these discomforts. Two of the key tools I use to get to the bottom of digestive concerns are the SIBO breath test and the GI-MAP stool test. While both tests offer valuable insights into your gut health, they focus on different aspects of digestion, and each plays a unique role in helping me understand what’s going on in your body
In this post, I’ll explain the differences between these two tests, how they work, and how they can work together to help you achieve better digestive health.
What is the SIBO Breath Test?
SIBO, or Small Intestinal Bacterial Overgrowth, occurs when bacteria overgrow in the small intestine, leading to symptoms like bloating, gas, diarrhea, constipation, and food sensitivities (high FODMAP foods). The SIBO breath test helps diagnose this condition by measuring the gases (hydrogen and methane) produced when bacteria ferment carbohydrates in the small intestine.
How the SIBO Breath Test Works:
- You’ll drink a sugar solution, such as lactulose or glucose, which bacteria in your small intestine will ferment.
- After drinking the solution, I’ll ask you to exhale into a tube at regular intervals.
- The breath sample will be analyzed for elevated levels of hydrogen and methane. If these gases are higher than normal, it suggests a bacterial overgrowth.
Why It’s Useful:
The SIBO breath test is ideal for people who experience bloating, fatigue, or digestive irregularities that may improve by following the Low FODMAP diet. If we suspect that small intestinal bacterial overgrowth is contributing to your symptoms, this test provides a clear diagnosis. It helps me pinpoint if bacterial overgrowth is the source of your discomfort so we can treat it effectively.

What is the GI-MAP Stool Test?
The GI-MAP (Gastrointestinal Microbial Assay Plus) stool test is a more comprehensive test that evaluates the overall health of your gut. It looks at a wide range of microbes, including bacteria, viruses, fungi, and parasites, and also provides markers of gut inflammation and digestion.
How the GI-MAP Stool Test Works:
- You’ll collect a stool sample at home and send it to the lab.
- The lab analyzes the sample to check for a variety of potential pathogens (such as harmful bacteria, parasites, or fungi), imbalances in the microbiome, and markers of intestinal inflammation.
- I’ll review the results to assess the balance of beneficial vs. harmful microbes in your gut and whether infections or inflammation may be present.
Why It’s Useful:
The GI-MAP stool test is an excellent tool if you have chronic or complex digestive symptoms. This test looks beyond bacterial overgrowth and assesses the full spectrum of your gut health. If you have symptoms like persistent diarrhea, constipation, bloating, or unexplained weight changes, this test can reveal infections (like parasites), yeast overgrowth, or signs of inflammation that might be affecting your digestion.
How Do These Tests Differ?
Both tests provide essential information about your digestive health, but they focus on different areas:
- SIBO Breath Test: This test targets bacterial overgrowth in the small intestine. It’s especially useful if you have symptoms like bloating, excessive gas, or irregular bowel movements, which are often signs of SIBO. This test allows me to specifically identify if this condition is the culprit.
- GI-MAP Stool Test: The GI-MAP test is a comprehensive stool analysis that gives me a detailed view of your entire gut ecosystem. It helps me identify not only bacterial imbalances but also fungal overgrowth, parasitic infections, and inflammation in the gut. It’s perfect for people with more complex digestive issues or a combination of symptoms.

When Should You Consider Each Test?
- SIBO Breath Test: If you’re dealing with chronic bloating, gas, or digestive irregularities that don’t improve with diet, and suspect you might have an overgrowth of bacteria in your small intestine, this test can help confirm whether SIBO is the underlying issue.
- GI-MAP Stool Test: If your digestive symptoms are more complex or ongoing, and you want a deeper look at the balance of your gut microbiome, the GI-MAP stool test is a great choice. This test can help identify pathogens, fungal overgrowth, and signs of inflammation in the gut, providing a broader picture of your digestive health.
How Can These Tests Help You?
The information I get from both the SIBO breath test and the GI-MAP stool test helps me design a treatment plan that addresses the root causes of your digestive issues, not just the symptoms. These tests give me the insights I need to guide you toward the right treatment options, whether it’s dietary changes, targeted supplements, or other naturopathic therapies.
By working together, we can take a thorough, individualized approach to your digestive health. I believe in addressing the underlying causes of your discomfort, so you can feel better and live a more vibrant life.
Take the Next Step Toward Better Digestive Health
If you’re struggling with digestive symptoms and feel like you’re not getting to the bottom of the issue, I invite you to schedule a consultation. Together, we can explore whether the SIBO breath test or the GI-MAP stool test (or both) would be helpful in diagnosing your condition. Once we have the right information, we’ll create a personalized treatment plan to restore balance to your gut and improve your overall health.
Contact me today to book an appointment, and let’s start your journey toward better digestive health!