Intestinal Ultrasound Index Calculator Crohn´s Disease
Advanced tool for calculating validated ultrasound activity indices in IBD
Developed by Dr. J. Poza Cordon · Hospital Universitario La Paz, Madrid · 2025 ·
@joaquin_poza
Wall Thickness Measurements
Enter all 4 measurements to calculate the average
Limberg Index
Doppler signal intensity classification
🇪🇸
Simple US Score
Complete measurements to see results
References:
• Ripollés T, Poza J, Suárez C, et al. Inflamm Bowel Dis. 2021
• Ripollés T, Poza J, Suárez C, et al. Inflamm Bowel Dis. 2024
→ >5.5 → active disease (S: 88%, E: 94%, PPV: 97%)
→ >8 → predicts SES-CD >7 (S: 73%, E: 72%)
• Ripollés T, Poza J, Suárez C, et al. Inflamm Bowel Dis. 2021
• Ripollés T, Poza J, Suárez C, et al. Inflamm Bowel Dis. 2024
→ >5.5 → active disease (S: 88%, E: 94%, PPV: 97%)
→ >8 → predicts SES-CD >7 (S: 73%, E: 72%)
🇮🇹
BUSS Score
Complete measurements to see results
References:
• Allocca M. Aliment Pharmacol Ther. 2022
• Allocca M, et al. Clin Gastroenterol Hepatol. 2022
→ >3.52 → active disease (S: 83%, E: 85%)
→ Limberg ≥1 → defines hyperemia
→ A reduction of ≥1.2 points on follow-up is associated with endoscopic response (≥50% reduction in SES-CD); AUC = 0.79
• Allocca M. Aliment Pharmacol Ther. 2022
• Allocca M, et al. Clin Gastroenterol Hepatol. 2022
→ >3.52 → active disease (S: 83%, E: 85%)
→ Limberg ≥1 → defines hyperemia
→ A reduction of ≥1.2 points on follow-up is associated with endoscopic response (≥50% reduction in SES-CD); AUC = 0.79
🇨🇦
IBUS-SAS (Ultrasound Activity Index)
Complete all fields to see results
References:
• Novak KL, et al. J Crohns Colitis. 2020 (original IBUS-SAS development)
• Dragoni G, et al. J Crohns Colitis. 2023 (>25.2 active disease; Sens: 82%, Spec: 100%, AUC: 0.89)
• Madsen GR, et al. Clin Gastroenterol Hepatol. 2025 (>63 surgery risk at diagnosis; Sens: 100%, Spec: 73%, AUC: 0.92)
• Huang Z, et al. Inflamm Bowel Dis. 2023 (score <25 predicts mucosal healing post-induction; AUC: 0.85)
→ >25.2 → active disease
→ <25 → predictor mucosal healing post-induction
→ >63 → risk of surgery at diagnosis
• Novak KL, et al. J Crohns Colitis. 2020 (original IBUS-SAS development)
• Dragoni G, et al. J Crohns Colitis. 2023 (>25.2 active disease; Sens: 82%, Spec: 100%, AUC: 0.89)
• Madsen GR, et al. Clin Gastroenterol Hepatol. 2025 (>63 surgery risk at diagnosis; Sens: 100%, Spec: 73%, AUC: 0.92)
• Huang Z, et al. Inflamm Bowel Dis. 2023 (score <25 predicts mucosal healing post-induction; AUC: 0.85)
→ >25.2 → active disease
→ <25 → predictor mucosal healing post-induction
→ >63 → risk of surgery at diagnosis
🇳🇴
SUS-CD (Segmental Ultrasound Score)
| Segment | Thickness (mm) | Limberg (0–3) |
|---|
Complete segment data to see results
Reference: Saevik F et al. J Crohns Colitis. 2021
• >0 → active disease (S: 95%, E: 70%)
• ≥3 → SES-CD >7 (S: 88.5%, E: 69%)
• >0 → active disease (S: 95%, E: 70%)
• ≥3 → SES-CD >7 (S: 88.5%, E: 69%)
Final Summary
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Developed by @joaquin_poza