a maximum sensitivity and specificity of 93% and 90%, respectively; between IBS and inactive inflammatory bowel disease with a maximum sensitivity and specificity of 89% and 80%, respectively; between IBS and all inflammatory bowel disease patients with a maximum sensitivity of 92% and specificity of 78%; and between IBS and healthy controls with a maximum sensitivity and specificity of 74% and 81% respectively. Following construction of a receiver operating characteristics (ROC) curve, the area under the curve (AUC) for all comparisons ranged between 83.2% for differentiating between IBS and healthy controls and 96.5% for differentiating between IBS and active inflammatory bowel disease.This study highlights the increasing interest in volatile organic compounds for diagnosing and monitoring gastrointestinal diseases.6 This is not the first study to use volatile compounds in differentiating IBS from organic disease and health. A previous case-control study, from the same investigators, used faecal volatile compounds to differentiate IBS-D from inflammatory bowel disease and health 7 and, in a more recent case-control study, a panel of exhaled organic compounds to differentiate IBS from health was derived and validated. 8 Although the findings of this study are encouraging, and perhaps moves us a step closer to a point-of-care test for diagnosing IBS, to date the findings of all these studies have yet to be replicated in large, unselected cohorts of patients presenting with lower gastrointestinal symptoms. Until then, symptom-based diagnostic criteria should remain the recommended method for diagnosing IBS.