Importance: Olfactory dysfunction (OD) is a common and underdiagnosed condition that is associated with increased morbidity and mortality. However, existing smell tests can be costly and time intensive and can lack scalability.
Objective: To evaluate the performance of a novel, self-administered mobile application-based olfactory screening tool.
Design, setting, and participants: This diagnostic study was conducted at a tertiary academic medical center in the US between June 1 and December 31, 2024, to assess the performance of a novel olfactory test for the detection of OD. English-speaking individuals who were 18 years or older were recruited for the study.
Intervention: Completion of a 5-item, mobile application-based smell identification test. A subset of participants also completed a comparator test.
Main outcomes and measures: Diagnostic performance of a novel smell identification test in detecting OD compared with that of a comparator test. Secondary outcomes included correlation with subjective olfactory function.
Results: The study included 484 participants, 243 (50.2%) of whom were men. The mean (SD) age was 53.4 (18.5) years; 160 participants (33.1%) were 65 years or older. Seventy-four participants (15.3%) reported having subjective OD. Participants with self-reported OD had significantly lower novel test scores than those with normosmia (2.54 vs 3.50; mean difference, -0.96 [95% CI, -1.24 to -0.68]). At a cut point of less than 3, the novel test achieved an area under the curve of 0.87 (95% CI, 0.78-0.96), a sensitivity of 74% (95% CI, 51%-88%), and a specificity of 86% (95% CI, 72%-93%). Novel test scores correlated with comparator test scores (r = 0.74 [95% CI, 0.59-0.83]) as well as self-reported smell (r = 0.34 [95% CI, 0.25-0.41]), with acceptable internal consistency (Cronbach α = 0.70-0.71). Novel test scores declined with age, and women aged 18 to 29 years had higher scores than men in the same age group.
Conclusions and relevance: The findings of this diagnostic study suggest that the novel study test is a rapid and reliable olfactory screening tool that correlates well with validated smell tests and has potential for longitudinal screening of OD in the clinical setting.
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