Intestinal Ultrasound Index Calculator – Ulcerative Colitis
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 measurements to calculate the average
UC-UIS Score
Complete all fields to see UC-UIS Score
Reference:
• Bots S, et al. J Crohns Colitis. 2021
• BWT > 2.1 mm → Mayo ≥1
• BWT > 3.2 mm → Mayo ≥2
• BWT > 3.9 mm → Mayo 3
• UC-UIS Score correlates strongly with endoscopic Mayo score
• Bots S, et al. J Crohns Colitis. 2021
• BWT > 2.1 mm → Mayo ≥1
• BWT > 3.2 mm → Mayo ≥2
• BWT > 3.9 mm → Mayo 3
• UC-UIS Score correlates strongly with endoscopic Mayo score
MUC – Milan Ultrasound Criteria
Complete both fields to calculate MUC
References:
• Allocca M, et al. UEGJ 2021 (development)
• Allocca M, et al. UEGJ 2022 (validation)
• MUC ≥ 6.2 → Predicts endoscopic activity
(Sensitivity 85%, Specificity 94%, AUC 0.90)
• Allocca M, et al. UEGJ 2021 (development)
• Allocca M, et al. UEGJ 2022 (validation)
• MUC ≥ 6.2 → Predicts endoscopic activity
(Sensitivity 85%, Specificity 94%, AUC 0.90)
IBUS-SAS – Intestinal US Score (CU)
Complete all fields to calculate IBUS-SAS
References:
• Novak KL et al. J Crohns Colitis 2020 (development)
• Fischer S et al. UEG Journal 2025 (validation in UC)
• Novak KL et al. J Crohns Colitis 2020 (development)
• Fischer S et al. UEG Journal 2025 (validation in UC)
Cut-offs (Fischer 2025):
• ≥15.9 → Activity – Se: 100%, Sp: 80%, AUC: 0.97
• ≥38.4 → Moderate activity – Se: 78%, Sp: 82%, AUC: 0.83
• ≥69.2 → Severe activity – Se: 66.7%, Sp: 94%, AUC: 0.89
• ≥15.9 → Activity – Se: 100%, Sp: 80%, AUC: 0.97
• ≥38.4 → Moderate activity – Se: 78%, Sp: 82%, AUC: 0.83
• ≥69.2 → Severe activity – Se: 66.7%, Sp: 94%, AUC: 0.89
Developed by @joaquin_poza