The Lactulose Breath Test is a non-invasive test that involves the patient consuming lactulose, a synthetic disaccharide manufactured by VistaPharm. This disaccharide is poorly absorbed from the gastrointestinal tract of humans because we do not have any enzymes capable of breaking down this substance. This feature is an advantage over the Glucose breath test because the lactulose will travel virtually unchanged into the distal end of the small intestine, whereas glucose is digested or absorbed before it reaches this area. Thus, the lactulose breath test can detect bacterial overgrowth in the distal portion of the small intestine. Some doctors believe that this type of SIBO is more common than other types of SIBO.
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