Background: Crohn's disease (CD) has a UK prevalence of 145per 100,000 of the population [R1] . We aimed to explore theimpact of ethnicity on the length of hospital stay (LOS) in patientswith CD.Methods: Anonymous data of adult patients admitted to 7 hospitalswithin the North West of England between 2000 and 2013 wereobtained and processed using the ACALM (Algorithm for Co-morbidity,Associations, Length of stay and Mortality) study protocol. ACALMuses the ICD-10 and OPCS-4 coding systems to identify patients [R2][R3] . The impact of ethnicity on prevalence and LOS was analysedusing SPSS.Results: Of 929,465 patient admissions, 3,439 (0.37%) were codedfor CD. Females accounted for 55.5% of CD admissions. Patientswere more likely to be admitted as an emergency (77.8%). CD wasmost common in Caucasian patients (87.6%) who were also morelikely to have co-morbidities (17.9%). Logistic regression analysisaccounting for variations in age, gender and co-morbidities revealedthat LOS in patients with CD was significantly shorter in SouthAsian patients. Table 1 describes the sample demographics and LOSConclusions: CD is more prevalent in the Caucasian population,with ethnic variations in the LOS. The significantly shorter LOS inthe South Asian population may be due to stronger family supportfacilitating discharge. Further understanding of such disparities isessential in the planning and development of healthcare services inregions with large multi-ethnic populations.