Background and Aims To improve management of patients with Crohn’s disease, objective measurements of disease activity are needed. Ileocolonoscopy is the current reference standard but has limitations that restrict repeated use. Ultrasonography is potentially useful for activity monitoring, but no validated sonographic activity index is currently in widespread use. Thus, we aimed to construct and validate a simple ultrasound score for Crohn’s disease. Methods Forty patients were prospectively examined with ultrasound and endoscopy in the development phase. The Simple Endoscopic Score for Crohn’s Disease [SES-CD] was used as a reference standard. Seven ultrasound variables [bowel wall thickness, length, colour Doppler, stenosis, fistula, stratification and fatty wrapping] were initially included, and multiple linear regression was used to select the variables that should be included in the final score. Second, the ultrasound data from each patient were re-examined for interobserver assessment using weighted kappa and intraclass correlation. Finally, the activity index was validated in a new cohort of 124 patients. Results Length, fistula and stenosis were excluded. The combination of the remaining variables provided a multiple correlation coefficient of r = 0.78. Interobserver analysis revealed poor agreement for stratification and fatty wrapping and these were thus excluded. There was excellent interobserver agreement for the remaining score consisting of wall thickness and colour Doppler. In both patient cohorts, the ultrasound score correlated well with SES-CD [Development cohort: rho = 0.83, p < 0.001, Validation cohort: rho = 0.78, p < 0.001]. A receiver operating characteristic curve analysis revealed an area under the curve of 0.92 and 0.88 for detecting endoscopic activity and moderate endoscopic activity, respectively. Conclusions A simple ultrasound activity index for Crohn’s disease consisting of bowel wall thickness and colour Doppler was constructed and validated and correlated well with endoscopic disease activity. ClinicalTrials. gov ID: NCT03481751

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Lutz Schwe mann er ph.d., europeisk spesialist i klinisk kjemi og laboratoriemedisin, laboratoriefaglig rådgiver ved Avdeling for medisinsk biokjemi, Helse Møre og Romsdal, Ålesund, og førsteamanuensis ved Institu for biologiske fag Ålesund, NTNU. Forfa eren har fylt ut ICMJE-skjemaet og oppgir ingen interessekonflikter.Ragnar Eriksen er spesialist i fordøyelsessykdommer og overlege ved Gastroenterologisk seksjon, Medisinsk avdeling, Helse Møre og Romsdal, Ålesund sjukehus. Forfa eren har fylt ut ICMJE-skjemaet og oppgir ingen interessekonflikter.