I have excessive gas, when should I get tested for SIBO?

Persistent gas can raise suspicion of SIBO when associated with other symptoms or risk factors. The test is not automatically indicated for all individuals experiencing excessive gas.

What is SIBO and what symptoms can it cause?

SIBO is the acronym for Small Intestinal Bacterial Overgrowth. The condition occurs when there is an abnormal increase of bacteria in this region associated with clinical manifestations.

Abdominal distension, excessive gas, abdominal pain, and diarrhea are among the symptoms associated with SIBO. Among these symptoms, diarrhea shows a stronger association with the condition than abdominal distension.

Conditions associated with malabsorption can cause weight loss and nutritional deficiencies.

Gas and abdominal distension can also occur in food intolerances, constipation, irritable bowel syndrome, celiac disease, and other gastrointestinal conditions.

When can excessive gas warrant investigation for SIBO?

Investigation for SIBO becomes important when symptoms are persistent and there are factors that favor bacterial overgrowth.

Intestinal motility disorders are among these factors. Diabetic neuropathy, systemic sclerosis, gastroparesis, and hypothyroidism are examples of conditions associated with motility changes.

Anatomical changes in the digestive system can also increase the risk. Surgeries that modify intestinal anatomy, blind loops, fistulas, Crohn’s disease-related strictures, and ileocecal valve resection are some examples.

Chronic opioid use and some immunodeficiency conditions are also among the predisposing factors described for SIBO.

How is the SIBO breath test performed?

The breath test is a non-invasive method used in the investigation of SIBO. The patient ingests a solution containing glucose or lactulose and provides samples of exhaled air.

According to the Brazilian Federation of Gastroenterology, the test should last 90 minutes, with gas measurements every 15 minutes.

An increase of at least 20 parts per million of hydrogen from the baseline value is one of the criteria used to consider the test positive.

The breath test can yield false-positive and false-negative results. Interpretation should consider the test result, the patient’s symptoms, and risk factors.

Does having a lot of gas mean I need a SIBO test?

No. Excessive gas alone is not sufficient to indicate a breath test for everyone.

The American Gastroenterological Association recommends that SIBO investigation with breath testing be considered in a small subset of patients with risk factors.

The evaluation of gas and distension should consider other possible causes. Food intolerances, constipation, irritable bowel syndrome, and celiac disease can produce similar symptoms.

Weight loss and signs of nutritional deficiency may indicate the need for a broader investigation. Gastrointestinal bleeding and anemia also require medical evaluation, as they may be related to other digestive system diseases.

The combination of persistent symptoms and risk factors helps determine when a SIBO test may contribute to the diagnosis.