How is Irritable Bowel Syndrome diagnosed?

Keeping a food diary ,seek,
Blood test,Colonoscopy, Ct scan . Food Allergy test. Gastroenterologist,Internist physicals.

There is no way of getting a definitive test. Most General Practitioners will investigate and do a thorough medical history examination which is vital to rule out any other causes first. IBS often runs in families who have food sensitivities or several types of allergies so this would certainly help with diagnosis. Blood tests may be run to check for other conditions. A nutritionist / dietician will help to work out a eating plan and help to eliminate certain types of foods that likely trigger the IBS. Keeping a record of what you eat, when and what if any reactions to specific foods are encountered. The more information you are able to provide to your medical team the better it will help to establish IBS.