Ordering the Small Intestine Bacterial Overgrowth (SIBO) Breath Test | 3-Hours | Lactulose
Testing for bacterial overgrowth in the small intestine can help identify the cause of symptoms like bloating, gas, and digestive discomfort. This test measures both hydrogen and methane in your breath after drinking lactulose, which helps pinpoint where bacteria may be growing in your gut. Interestingly, research shows that SIBO can sometimes be linked to conditions like osteoporosis and anemia, not just digestive problems.
Ordering this test can help you:
- Find out if bacterial overgrowth is causing your digestive symptoms
- Identify if hydrogen or methane-producing bacteria are present
- Guide your doctor in choosing the right treatment plan
- Track changes in your gut bacteria after treatment
- Reduce the risk of ongoing nutrient absorption problems
Who Should Consider Breath Testing for Gut Bacteria Imbalance
People who have ongoing bloating, gas, or changes in bowel habits after eating certain foods may benefit from this test. For example, someone who feels tired and uncomfortable after meals, with frequent belching and stomach cramps, could use this test to find out if bacteria in the small intestine are the cause.
Ordering this test may also be helpful if you:
- Have unexplained diarrhea or constipation that does not improve
- Experience frequent stomach pain or cramping after eating
- Notice food intolerances that seem to be getting worse
- Have been diagnosed with irritable bowel syndrome but want more answers
- Are dealing with unexplained iron deficiency anemia, which can sometimes be linked to gut bacteria
Testing for bacterial overgrowth can help you and your doctor find the reason for your symptoms, choose the right treatment, and prevent problems like poor nutrient absorption from getting worse if left unchecked. To move forward, order the test to get clear answers about your digestive symptoms.
Preparing for Your Digestive Breath Analysis
You will need to fast for at least 12 hours before collecting your breath samples for this test. Make sure to carefully follow any instructions your doctor or healthcare provider gives you, as these steps help ensure your results are as useful as possible.
Labs Included When Ordering Your Small Intestine Bacterial Overgrowth (SIBO) Breath Test | 3-Hours | Lactulose
| Test Name | Reference Range | What the Test Measures | Low and High Levels of Small Intestine Bacterial Overgrowth (SIBO) Breath Test |
|---|---|---|---|
| Hydrogen (Breath) | 0-20 ppm (parts per million) baseline; rise of >20 ppm within 90 minutes is considered positive |
Hydrogen in the breath is produced when bacteria in the small intestine ferment sugars like lactulose. High levels after drinking lactulose suggest bacterial overgrowth in the small intestine. | High levels mean there is likely an overgrowth of hydrogen-producing bacteria in the small intestine.
Low levels mean there may be fewer hydrogen-producing bacteria, or the bacteria present do not produce hydrogen. |
| Methane (Breath) | 0-10 ppm baseline; rise of >10 ppm at any time is considered positive |
Methane is made by certain gut bacteria when they break down lactulose. High methane levels are often linked to constipation and can show a different type of bacterial overgrowth. | High levels mean there is likely an overgrowth of methane-producing bacteria, which can be linked to constipation.
Low levels mean there may be fewer methane-producing bacteria, or the bacteria present do not produce methane. |
Reference ranges may change slightly as labs update their methods or as new research becomes available.
Small Intestine Bacterial Overgrowth (SIBO) Breath Test FAQ
Is there Small Intestine Bacterial Overgrowth (SIBO) Breath Test testing near me?
This is a home test kit, so you can collect your breath samples wherever you are most comfortable and then send them to the lab. For those dealing with unpredictable digestive symptoms, being able to collect samples at home makes the process easier and avoids the stress of traveling to a clinic.
How do I interpret the test results?
While your doctor should review your results, we also offer a one-on-one test results review with our clinical team to help you understand what your numbers mean and what steps to take next.
What is the cost of the test?
The price you see for this test includes standard shipping to your address and return shipping to the lab, but local draw fees may apply. Testing can help you find out if gut bacteria are causing your symptoms, so you can start the right treatment sooner.
How often should I retest?
Retesting is usually recommended 4-6 weeks after finishing treatment or making changes to your diet, so you can see if your gut bacteria have improved. This helps you and your doctor know if your treatment is working or if you need to try something different.
How accurate is the test?
This test uses gas chromatography to measure hydrogen and methane in your breath, with a specificity of 86% and a sensitivity of 78%. TrueHealthLabs.com partners with CLIA-certified and CAP-certified laboratories to uphold rigorous testing standards for dependable results.
Important Notes
- Do not order or complete this test if you are allergic to lactulose or are diabetic.
Medical Review Board
Reviewed by Jeff Donohue M.D. from Body Logic and Brady Hurst DC, CCCN. Written by True Health Lab’s team of editorial health contributors.
Disclaimer: This information is for educational purposes only and not intended as medical advice. Consult your healthcare provider for personalized guidance.
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