| Investigation | Patient <20 years old | Patient 21–40 years old | Patient 41–60 years old | Patient >61 years old |
| Colonoscopy with ileoscopy and biopsies | ||||
| Barium follow-through/enteroclysis | ||||
| Small bowel ultrasound | ||||
| Small bowel MRI | ||||
| CT +/− CT enteroclysis | ||||
| Capsule endoscopy |
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