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测定呼气H_2浓度是现代胃肠学的多用途试验。碳水化合物以及食物纤维和糖蛋白在大肠被厌氧菌丛发酵产生的H_2,吸收入血,不进入代谢过程,而由肺排出;呼气H_2浓度和大肠产生的H_2量呈正比。用气体层析法和电化学法测定呼气H_2浓度,以ppm 表示。通常禁食12h 以后,呼气H_2浓度不超过8～12ppm,正常上界为15ppm。空腹时H_2浓度升高见于上消化道有过多细菌生长的疾病,如成人脂肪痢,想室和胃切除术后等.
Determination of expiratory H 2 concentration is a modern gastrointestinal multi-purpose test. Carbohydrates, as well as dietary fibers and glycoproteins, are produced in the large intestine by anaerobic bacterial fermentation and absorbed into the bloodstream without entering the metabolic process, leaving the lungs excreted. The expiratory H 2 concentration is proportional to the amount of H 2 produced in the large intestine. Exhaled H 2 concentration was determined by gas chromatography and electrochemistry, expressed in ppm. Usually 12h after fasting, exhaled H_2 concentration does not exceed 8 ~ 12ppm, the upper limit of normal 15ppm. H 2 concentration fasting seen in the upper digestive tract have too many bacterial diseases, such as adult fat diarrhea, room and gastrectomy and so on.