Sibo Breath Test: An Overview

Introduction:

Breath testing is the most commonly employed diagnostic method for small intestinal bacterial overgrowth (SIBO). SIBO is a medical condition in which excessive numbers of coliform bacteria are found in the small intestine, causing several gastrointestinal (GI) symptoms such as bloating, stomach pain, flatulence (gas builds up in the digestive system), nausea, dyspepsia (indigestion), diarrhea, and constipation. The exact prevalence of SIBO is not well established. Irritable bowel syndrome, intestinal motility problems, and chronic pancreatitis are the most common causes of sibo, accounting for 80 to 90 percent of cases. It is more frequent among women and the elderly. SIBO can be detected using SIBO breath testing, an important technique for diagnosing this illness. This article provides a brief overview of the SIBO breath test.

What Is SIBO?

SIBO refers to small intestinal bacterial overgrowth, which means excessive numbers of coliform bacteria from the colon (large intestine) are found in the small intestine. Normally, the small intestines have fewer bacteria due to stomach acid and peristalsis movement (muscle contraction). Small intestinal bacterial overgrowth (SIBO) can occur when protective mechanisms like peristalsis and stomach acid against excessive bacterial growth fail to work. The bacteria in the colon enter the small intestines, and they begin to break down sugars before the body can digest them. As a result, excess gas production occurs, including methane and hydrogen. SIBO may show up with the following symptoms:

• Loss of appetite.

• Abdominal pain.

• Nausea.

• Bloating.

• A feeling of fullness after eating.

• Diarrhea.

• Unintentional weight loss.

• Malnutrition.

SIBO, or small intestine bacterial overgrowth, can result from:

• Complications following abdominal surgery, such as gastrectomy for treating stomach cancer, peptic ulcers (stomach ulcers), and gastric bypass surgery to treat obesity.

• Structural issues in and around the small intestine.

• Crohn's disease (an inflammatory bowel disease that involves chronic inflammation of the gastrointestinal tract), radiation enteritis (radiation-related damage to the small and/or large intestine), scleroderma (a disorder in which fibrous tissue accumulates in the skin and other parts of the body), celiac disease (a longstanding digestive and immunological disease that affects the small intestine), diabetes (high blood sugar), and other disorders can decrease food and waste product flow (motility) through the small intestine.

SIBO symptoms are common and can be seen in other conditions, so symptoms alone cannot diagnose the condition.

What Is a SIBO Breath Test?

The SIBO (small intestinal bacterial overgrowth) breath test is a non-invasive diagnostic test that detects bacterial overgrowth in the small intestine. It measures the gasses released by bacteria in small intestines, such as methane and hydrogen. The gasses released by bacteria in the small intestine get absorbed into the bloodstream. It then travels to the lungs, where they are breathed out. Doctors then collect these gasses in SIBO breath tests to diagnose SIBO. Based on the carbohydrates used as substrates, the SIBO breath test is of two types:

• Glucose breath test.

• Lactulose breath test.

How Is the SIBO Test Performed?

The steps involved in the test may vary depending on whether it is conducted at home or in a medical facility.

• Before the Test: The healthcare provider will give instructions. Doctors recommend avoiding certain foods high in fiber, sugar, or alcohol, which can impact test results. Fasting for eight to 12 hours before the test may also be recommended. A doctor will confirm when to stop eating and drinking. Additionally, medications like antibiotics and supplements that could affect breath test results should be avoided. Consultation with healthcare providers before stopping any medication is advisable, as an adjustment to the treatment plan or an alternative medication may be necessary.

• At-Home Test: The doctor will give you a kit containing a sugar solution (lactulose or glucose) and a device to take breath samples. First, eat the sugar solution that comes with the test kit. Then, the test samples will be taken using the included collection tubes at specific time intervals. After finishing, send the sample back to the laboratory or the doctor for analysis.

• At Medical Facility: Before the test starts, the doctor will take a baseline breath sample from the patient upon arrival to determine the baseline levels of hydrogen and methane. After that, they will provide a sugar solution (like glucose or lactulose) to drink. A certain kind of sugar is present in the sugar solution, which the bacteria in the small intestine can ferment to produce either methane or hydrogen gas. The doctor takes Breath samples at specific intervals, usually 15 to 20 minutes, for a maximum of three hours. The collected samples are then sent to the laboratory for evaluation.

What Does the SIBO Test Result Indicate?

Test results received after the SIBO breath test can be positive or negative.

• Positive Results: Positive test results show elevated levels of hydrogen by 20 parts per million (ppm) within 90 minutes and methane of more than ten parts per million in the breath after ingesting the sugar solution, indicating bacterial overgrowth in the small intestine.

• Negative Results: The negative test result shows a normal range of hydrogen and methane gas in breath, indicating no significant bacterial overgrowth in the small intestine.

What Are the Limitations of Lactulose Breath Test and Glucose Breath Test?

Lactulose and glucose breath tests have limitations for diagnosing SIBO (small intestinal bacterial overgrowth). A lactulose breath test may better detect SIBO in the small intestine's lower part. However, it can give false positives because bacteria in the colon can break down lactulose and create gas. A glucose breath test reduces false positive results but may miss SIBO in the lower part of the intestine.

Conclusion:

A SIBO breath test, which includes a lactulose breath test and glucose breath test, is a noninvasive test for detecting the presence of small intestinal bacterial overgrowth (SIBO). This condition can produce a variety of gastrointestinal (GI) related symptoms such as bloating, stomach pain, gas builds in the digestive tract, unintentional weight loss, nausea, diarrhea, and constipation. This test can be performed either at home or in a medical setting. To get accurate test results, the doctor may recommend some instructions before the test, such as how to take medications, adhere to food restrictions, and make other preparations.