(BPT) - Irritable Bowel Syndrome (IBS) is a common gastrointestinal disorder (GI) associated with abdominal pain, discomfort and altered bowel habits including diarrhea and constipation. IBS is the most common GI disorder in the U.S. and affects an estimated 40 million Americans, of which 70 percent are undiagnosed. It can often take up to five years and visits with up to four healthcare providers to get a proper diagnosis. A new blood test spares these years of uncertainty by reliably diagnosing IBS within 24 hours.