Small intestinal bacterial overgrowth is defined as the presence of excessive numbers of bacteria in the small bowel, causing gastrointestinal symptoms. This guideline statement evaluates criteria for diagnosis, defines the optimal methods for diagnostic testing, and summarizes treatment options for small intestinal bacterial overgrowth. This guideline provides an evidence-based evaluation of the literature through the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) process. In instances where the available evidence was not appropriate for a formal GRADE recommendation, key concepts were developed using expert consensus.

中文翻译：

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ACG临床指南：小肠细菌过度生长。

小肠细菌过度生长定义为在小肠中存在过多细菌，导致胃肠道症状。该指南声明评估了诊断标准，定义了诊断测试的最佳方法，并总结了小肠细菌过度生长的治疗方案。本指南通过“建议评估，制定和评估的分级”（GRADE）过程对文献进行了循证评估。如果可用的证据不适合GRADE的正式建议，则使用专家共识来开发关键概念。