AGA Guideline on the Laboratory Evaluation of Functional Diarrhea and Diarrhea-Predominant Irritable Bowel Syndrome in Adults 6 Aug, 2019 | 08:15h | UTC AGA Guideline on the Laboratory Evaluation of Functional Diarrhea and Diarrhea-Predominant Irritable Bowel Syndrome in Adults (IBS-D) – Gastroenterology (free)