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Utility of a three-item smell identification test in detecting olfactory dysfunction
Alexis H Jackman1, Richard L Doty
1Smell and Taste Center, Department of Otorhinolaryngology-Head and Neck Surgery, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA. alexis.jackman@uphs.upenn.edu
The Laryngoscope
|December 22, 2005
Summary
A new three-item smell test effectively screens for olfactory dysfunction, showing high sensitivity in detecting smell loss, especially severe cases. Its reliability makes it a suitable tool for clinical use in identifying olfactory impairment.
Area of Science:
- Otolaryngology
- Neuroscience
- Sensory Science
Background:
- Physician assessment of smell function is infrequent due to time constraints.
- Existing brief screening tests for olfactory dysfunction lack adequate validation.
- There is a clinical need for rapid and reliable methods to assess cranial nerve I function.
Purpose of the Study:
- To empirically evaluate the diagnostic utility of a novel three-item microencapsulated odor identification test.
- To determine the sensitivity, specificity, and predictive values of the brief test in identifying olfactory dysfunction.
- To assess the test-retest reliability of the three-item olfactory screening tool.
Main Methods:
- A cohort of 224 patients underwent assessment at a university medical center's smell and taste center.
- The three-item test was administered alongside the validated 40-item University of Pennsylvania Smell Identification Test (UPSIT).
- Sensitivity, specificity, predictive values, and test-retest reliability were calculated relative to UPSIT results.
Main Results:
- The three-item test identified olfactory dysfunction in 99% of anosmia patients and 85% of severe microsmia patients.
- Sensitivity was 99% and specificity 40% for detecting total anosmia using a cut-off score of 2.
- The test demonstrated high test-retest reliability (0.87) and a negative predictive value of 98% for anosmia.
Conclusions:
- The brief three-item olfactory test is highly sensitive for detecting smell loss, particularly in patients with significant olfactory dysfunction.
- While specificity is moderate, the test's high reliability and negative predictive value support its use as a screening tool.
- This microencapsulated odor identification test offers a practical solution for brief olfactory screening in clinical settings.