Breath TestsMethaneHelicobacter InfectionsHelicobacter pyloriLactuloseCarbon IsotopesUreaGastric EmptyingHydrogenMethylococcaceaeAminopyrineCaprylatesLactose IntoleranceCarbon DioxideAnti-Ulcer AgentsExhalationCarbon RadioisotopesDyspepsiaOmeprazoleMethylococcus capsulatusClarithromycinAmoxicillin2-PyridinylmethylsulfinylbenzimidazolesOxygenasesEuryarchaeotaBismuthUreaseGastrointestinal TransitTinidazoleMetronidazoleChylomicron RemnantsLactose Tolerance TestEthaneLansoprazoleMalabsorption SyndromesLiver Function TestsFalse Negative ReactionsSulfoxidesMethylosinus trichosporiumPeptic UlcerAcetamidesDuodenal UlcerBlind Loop SyndromeSensitivity and SpecificityDrug Therapy, CombinationIntestine, SmallMethylocystaceaeArchaeaAnti-Bacterial AgentsGastroparesisFurazolidoneRanitidineRabeprazoleIleocecal ValveLactoseSpectrophotometry, InfraredFlatulenceProton Pump InhibitorsMethanolFecesGastroscopyStomachDNA, ArchaealIrritable Bowel SyndromeAntitrichomonal AgentsPentanesGeologic SedimentsBacteriaBreath HoldingAcetatesMineral WatersGastrointestinal MotilitySpirulinaLoperamideMethanosarcinalesExocrine Pancreatic InsufficiencyGastritisRespirationEndoscopy, GastrointestinalSteatorrheaDihydropyrimidine Dehydrogenase DeficiencyPhenolsulfonphthaleinAnaerobiosisPancreatinPropanthelineOxidation-ReductionFermentationChromatography, GasReproducibility of ResultsGlutethimideDiphenoxylateAcetic AcidAtmosphereMethanomicrobiaceaeGasesTime FactorsMucositisIntestinal DiseasesGastrointestinal AgentsLiver Cirrhosis