Hi, Crohn s disease and irritable bowel syndrome have some very similar symptoms, as such all doctors run a series of tests to determine which one of them you have, think of it as a process of elimination. The tests used are- blood tests CT scan colonoscopy and biopsy MRI If none of these have shown you having particular signs related with cronhn s disease, then it is quite likely that you dont have it. Just for curiosities sake I shall list some of the results that would ve shown up if you had crohn s disease Blood test - anemia CT scan - to check for complications such as partial blockages, abscesses or fistulas Colonoscopy and biopsy - to look for clusters of inflammatory cells called granulomas, which help confirm the diagnosis of Crohn s disease MRI - particularly useful for evaluating a fistula around the anal area (pelvic MRI) or the small intestine (MRI enterography). I hope this answered your question.