０　引言　呼气中的氢气是由肠道细菌分解碳水化合物所产生，近年来国内外多以糖呼气氢试验（ＢＨＴ）作为诊断乳糖酶缺乏、小肠细菌过度生长等消化道疾病的指标．但空腹呼气氢试验本身的意义并不清楚．为了确定我国健康儿童空腹呼气氢的正常值，我们测定了２３１名健康儿... 0 Introduction Exhalation of hydrogen is produced by the intestinal bacteria to break down carbohydrates in recent years at home and abroad to more sugar breath hydrogen test (BHT) as a diagnosis of lactase deficiency, intestinal bacterial overgrowth and other gastrointestinal diseases indicators. However, the meaning of fasting breath hydrogen test itself is not clear. In order to determine the normal value of fasting expired hydrogen in healthy children in our country, we measured 231 healthy children.