Various breath tests help diagnose conditions such as Helicobacter pylori infection: Urea breath test Carbohydrate intolerance: Hydrogen (H2) breath test (lactose or fructose breath test) Small intestinal bacterial overgrowth: Glucose-hydrogen or lactulose - hydrogen breath tests Wireless motility capsule Wireless motility capsule involves an ingestible device that continuously measures the pressure and pH of the intraluminal environment as the device travels through the gastrointestinal tract.