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By Barbara Bradley Bolen, Ph.D.
Updated March 05, 2012
A biomarker is an objective, biological measure that is used to assess health or make a diagnosis of disease.
Irritable bowel syndrome (IBS) is considered a functional gastrointestinal disorders because it lacks any clear-cut biomarkers.
Barbara Bradley Bolen, Ph.D.
About.com Irritable Bowel Syndrome
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