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How Many and Which Odor Identification Items Are Needed to Establish Normal Olfactory Function?

Jörn Lötsch1, Alfred Ultsch2, Thomas Hummel3

  • 1Institute of Clinical Pharmacology, Goethe - University, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany, Project Group Translational Medicine and Pharmacology TMP, Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Theodor-Stern-Kai 7, 60596 Frankfurt am Main, Germany, j.loetsch@em.uni-frankfurt.de.

Chemical Senses
|February 10, 2016
PubMed
Summary
This summary is machine-generated.

A simple 3-odor test can reliably diagnose normal olfactory function (normosmia). This screening method accurately identifies normosmia, potentially reducing lengthy olfactory testing procedures in clinics.

Keywords:
ABC analysisbioinformaticsclinical assessmenthuman olfactionpatients

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Sensory Science

Background:

  • Olfactory dysfunction diagnosis often involves lengthy test batteries.
  • A simple, reliable test is needed to streamline clinical olfactory assessments.
  • Current methods may not efficiently distinguish between normosmia and olfactory loss.

Purpose of the Study:

  • To determine the minimum number of odor identification items required for accurate diagnosis of normosmia.
  • To develop and validate a brief screening test for normal olfactory function.
  • To assess the diagnostic performance of a proposed 3-odor screening test.

Main Methods:

  • Retrospective analysis of 16-odor identification by 613 subjects (aged 18-96).
  • Subjects were diagnosed with anosmia, hyposmia, or normosmia.
  • Statistical calculation to determine the optimal number of items for normosmia diagnosis; validation of a 3-odor screening test (cinnamon, fish, banana).

Main Results:

  • Cinnamon was the best-performing odor, correctly identified by most normosmic subjects and fewest anosmic patients.
  • A single odor identification item was calculated as sufficient for normosmia diagnosis.
  • The proposed 3-odor screening test achieved 80.4% sensitivity, 84.3% specificity, and 91.3% negative predictive value.

Conclusions:

  • A brief screening test using just three specific odors can reliably establish normal olfactory function (normosmia).
  • This 3-odor test offers a validated method to potentially reduce the duration of clinical olfactory assessments.
  • Positive results from this screening test provide confidence to conclude olfactory assessments efficiently.