 They are also useful for looking for intra-abdominal complications of Crohn's disease, such as abscesses, small bowel obstructions, or fistulae.Magnetic resonance imaging (MRI) is another option for imaging the small bowel as well as looking for complications, though it is more expensive and less readily available.MRI techniques such as diffusion-weighted imaging and high-resolution imaging are more sensitive in detecting ulceration and inflammation compared to CT.

A complete blood count may reveal anemia, which commonly is caused by blood loss leading to iron deficiency or by vitamin B deficiency, usually caused by ileal disease impairing vitamin B absorption.