If a doctor notices any of the following during a physical exam, he or she may suspect Crohn's disease.

• Abdominal mass
• Abdominal tenderness
• Mouth ulcers
• Joint Swelling

The following tests can be used to diagnose Crohn's disease:

• Barium enema or upper GI series
• Colonoscopy or sigmoidoscopy
• Computed tomography (CT scan) of the abdominal area
• Endoscopy or capsule endoscopy
• Magnetic Resonance imaging (MRI) of the abdominal area
• Enteroscopy

A doctor might also request a stool culture to make sure the symptoms are not caused by something else.

Crohn's disease can also change the results of these tests:

• Albumin
• C-reactive protein
• Erythrocyte sedimentation rate
• Fecal fat
• Hemoglobin
• Liver function tests
• White blood cell count