Methods: In this retrospective cross-sectional study, we used the Alberta Health Services’ Sunrise Clinical Manager and Netcare databases to identify IBD patients initiated on biologic therapy (age >18yrs) in Calgary, Alberta between 2008 - 2018. Socio-demographic and clinical characteristics of patients were described. Linear and logistic regression models were constructed to identify factors associated with screening. All analyses were conducted using Stata 15.0 (University of London, UK).
Results: There was a total of 247 identified cases (48.18% female). Of these 96 were Ulcerative Colitis and 151 Crohn’s Disease. The mean age was 39.5 (14.8 SD). There was a total of 210 (85%) who had documented screening with the TST and 9 (3.4%) with the IGRA. In a multivariable analysis, factors associated with latent TB screening were age and outpatient setting at the time of screen. 6 patients (2.43%) had positive screens and 4 of those 6 were treated for latent TB infection.
Conclusion: TST remains the predominant screening method for latent TB infection although the ATS recommends both IGRA and TST prior to biologic therapy. Screening varied with age and higher rates were noted in those evaluated as outpatients compared to inpatients. Further work is needed to evaluate the barriers to screening and to improve access to latent TB screening particularly in the inpatient setting.