The safety and sensitivity of a telemetric capsule to monitor gastrointestinal hydrogen production in vivo in healthy subjects: a pilot trial comparison to concurrent breath analysis
Intestinal gases are currently used for the diagnosis of disorders including small intestinal bacterial overgrowth and carbohydrate malabsorption. The capsule measured >3000 times higher concentrations of hydrogen compared to breathe tests, resulting in a signal-to-noise ratio of 23.4 for the capsule compared to 4.2 for the breath test.

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