Testing for SIBO
The gold-standard test is a breath test. A gastroenterologist can perform this test in-office, or you can order a kit to test at home. You may find the home kit more comfortable. Or, you may prefer doing it at a doctor’s office.
Before the breath test, you do a prep diet for one day. This consists of food that is not fermented by small intestine gut bacteria. This includes meat, fish, eggs, fat, and broth. It can also include white bread and white rice, which quickly break down into glucose for absorbtion. It’s a pain, but it is just one day! I prefer that my patients avoid the white bread and rice, and just eat protein and fat.
The morning of the test, you take a breath sample. Then you drink a lactulose (or glucose) solution and take breath samples every 15-20 minutes over the course of two-three hours. Lactulose is highly fermentable, and as it travels through your small intestine, hungry bacteria quickly ferment it. They produce gases that show up in your breath samples. The gases reveal the type of bacteria, the overall load, and where the overgrowth is taking place in your small intestine.
A positive SIBO breath test
A positive test means too much bacteria that produce hydrogen, methane, or hydrogen sulfide gas – or a combination. Hydrogen gas typically indicates bacteria that cause diarrhea. Methane gas producers are actually a slightly different organism called archaea. They are similar to bacteria but not technically classified as bacteria. High levels of methane gas typically causes constipation. Hydrogen sulfide producers usually cause odorous gas.
It is important to know what type, or types, of bacteria are overgrown, and how high the gases measure in the test, because this will determine specific treatment choices and duration.
Treatment is multi-faceted and very much depends on the individual. We functional doctors prefer to have a stool analysis of your digestive function and large intestine microbiota, such as the GI Map test, to create an effective plan for you.
Knocking down the bacteria
In most cases it is useful to use pharmaceutical antibiotics or antimicrobial herbs to knock down (kill) the bacteria. Antibiotic and herbal combinations vary according to the type of bacteria you have. Research shows that drugs and herbs are equally effective, and in part it depends on what you best tolerate, in addition to what you have access to.
The gold-standard antibiotic is Xifaxin. At the time of this writing, this medication is expensive, and often difficult to get insurance companies to cover. Some find it easier to order it from overseas, with some sources being superior to others. Xifaxin is a “smart” drug because it specifically acts in your small intestine, without knocking down beneficial bacteria in your large intestine. Also, it does not get absorbed into your bloodstream and go through your liver. Methane producing archaea require an additional antibiotic called Neomycin.
In the U.S. these antibiotics are often prescribed for 10 days, however research shows they are far more effective if taken for 30 days.
Botanical (herbal) SIBO treatment is often better tolerated. These herbs have powerful broad-spectrum antimicrobial properties. We choose botanical combinations based on your:
- Type of gas.
- Level of gas.
- Constitution and overall health.
- Presence of coexisting gut infections (bacteria, yeast, parasites) that show up on a functional stool test such as the GI Map.
- Levels of beneficial bacteria.
Bacteria and yeast create sticky gluey biofilms for protection. Think of biofilms as a web that bacteria hide in. Breaking down these biofilms with specific enzymes allows the antimicrobial (kill) approach to work. You need to take these between meals, so the enzymes work to digest biofilms rather than your food. A supplement called NAC also works well for breaking down biofilms.
drawing out the bacteria for killing
An adjunctive approach in SIBO treatment is to feed the bacteria, to draw it out in order to kill it. There is evidence this works. We can do this with prebiotic supplements or foods. Some practitioners recommend a low fermentable diet during treatment, such as a low FODMAP approach, however it can be more effective to draw the bacteria out during treatment by eating FODMAP foods.
addition of probiotics
There is no research at this time that probiotics improve treatment efficacy. However, if SIBO comes with an imbalance in your colon microbiota (dysbiosis), the idea of rebalancing these populations is logical. Dysbiosis is often part of a SIBO picture, and the resulting inflammation can cause a weakening of the valve between your small and large intestine (ileocecal valve), thus allowing colon bacteria to backwash up into your small intestine.
Dumping in a bunch of random probiotics is not the fix, as SIBO is by definition an environment of too much bacteria. Many a time I’ve pulled patients off their probiotics when there is simply too much bacteria in their small intestines. Also, most probiotic supplements and foods contain lactobacillus strains that produce histamine, which is a problem for many people with SIBO. Probiotics that colonize in your large intestine, with rebalancing properties, are better tolerated. Reblancing means they have the ability to reduce overgrowths and feed beneficial strains. Some of my favorite SIBO-friendly probiotics include:
- Megasporebiotic, a soil-based organism with excellent rebalancing properties.
- Bifidus only as in Therbiotic Factor 4.
- Lactobacillus Plantarum, especially with methane producing SIBO.
- Saccaromyches Boulardi (except for those with colitis or Crohn’s).
fixing the root cause
Many people relapse after SIBO treatment, in particular if they don’t identify the root cause or follow up with a prevention plan. For example, I see lots of folks who took an antibiotic, felt better, and immediately relapsed. This isn’t the way out, and can be very frustrating.
The next post in this series is about preventing relapse. I dive into a root cause approach to preventing SIBO relapse, which is crucial in a SIBO treatment plan.
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