Reasons for unsuitability for intestinal ultrasound
| Patient group | Reason for IUS unsuitability | Cases, n (%) |
| Endoscopy cases | ||
| Assessment of inflammatory bowel disease | Surveillance | 27 (25) |
| Obesity | 13 (12) | |
| De-escalation proposed | 10 (9.3) | |
| Proctitis only | 9 (8.3) | |
| Trial | 4 (3.7) | |
| Complex surgical history | 4 (3.7) | |
| Dilatation planned | 3 (2.8) | |
| Stoma | 2 (1.9) | |
| Investigation of symptoms | Age ≥40 | 104 (68.4) |
| Obesity | 28 (18.4) | |
| Per rectal bleeding | 25 (16.4) | |
| Elevated CRP | 23 (15.1) | |
| Anaemia | 15 (9.9) | |
| Family history of bowel cancer | 11 (7.2) | |
| Elevated calprotectin | 5 (3.3) | |
| MRE cases | ||
| All | Complex surgical history | 18 (37.5) |
| Obesity | 14 (29.2) | |
| Other indication | 12 (25) | |
| Known upper gastrointestinal disease | 9 (19.1) | |
| Stoma | 5 (10.4) | |
CRP, C-reactive protein; IUS, intestinal ultrasound; MRE, magnetic resonance enterography.