Introduction: Geriatric Emergency Department (ED) guidelines recommend systematic screening of older patients for geriatric syndromes. However, compliance issues to this recommendation have already been observed. Self-assessment tools could be an interesting solution as self-assessed general, mental and physical health was shown to be predictive of functional decline and mortality. The Older Americans Resources and Services scale (OARS), is a simple geriatric functional assessment scale that is widely used by professionals to quantify patients’ ability to perform activities of daily living (ADL) and instrumental activities of daily living (IADL). However, its use as a self-assessment tool has never been tested. Objective: to evaluate the feasibility of the self-assessed OARS compared to its standard administration by a research assistant (RA) in older ED patients. Methods: A planned sub-analysis of a single center randomized crossover pilot study in 2018 was realized. Patients aged ≥65 who consulted to the ED for any medical reason were included. Patients were excluded if they: 1) required resuscitation (CTAS 1); 2) were unable to consent/to speak French; 3) had a physical condition preventing the use of an electronic tablet. Patients were randomized 1:1 to either 1) tablet-based functional status self-assessment or 2) the RAs questionnaire administration at first, after which they crossed-over to the other assessment method. Paired t-tests were used to assess the score differences. Results: 60 patients were included. Mean age was 74.4 ± 7.6 and 34 (56.7%) participants were women. Mean OARS score according to RA was 25.1 ± 3.3 and mean self-assessed OARS score was 26.4 ± 2.5 (p < 0.0001). There was also differences when looking at the AVQ and AIVQ separately. Mean AVQ scores were 12.5 ± 1.8 and 13.5 ± 0.9 (p < 0.0001) and mean AIVQ scores were 12.6 ± 1.8 and 12.9 ± 1.8 (p = 0.04) for RA assessment and self-assessment, respectively. Conclusion: Our results show a statistically significant difference between RA assessment and patient self-assessment of functional status, and this difference seems to be more pronounced regarding AVQ than AIVQ. The study confirms that self-assessment of functional status by older ED patients is feasible, but further testing is required in order to confirm the validity and psychometric values of this self-administered version of the OARS.