Evaluation of odor recognition threshold measurement methods in T&T olfactometry: A survey study

Area of Science:

• Otorhinolaryngology
• Olfactory Function Testing
• Medical Diagnostics

Background:

• T&T olfactometry is a standard method for assessing odor recognition thresholds.
• Current methods rely on examiner judgment or patient selection from an olfactory term table.
• Variability in these methods may impact diagnostic accuracy.

Purpose of the Study:

• To investigate the current practices regarding correct odor expressions for standard odors in T&T olfactometry.
• To clarify the utilization and perceived satisfaction with the olfactory term table.
• To identify areas for standardization in olfactory testing procedures.

Main Methods:

• A questionnaire was distributed to otolaryngologists and medical staff performing T&T olfactometry.
• The survey covered facility background, testing environment, odor recognition procedures, and olfactory term table use.
• Responses from 81 facilities were analyzed.

Main Results:

• Significant variation exists in the order of standard odors used and the criteria for correct odor expressions.
• When patients were uncertain, facilities employed different strategies, including presenting the olfactory term table or increasing odor concentration.
• Most facilities accepted odor expressions not listed in the olfactory term table, leading to inter-facility discrepancies.

Conclusions:

• Odor recognition threshold testing via T&T olfactometry exhibits considerable heterogeneity in defining correct odor expressions and utilizing the olfactory term table.
• These inconsistencies highlight a need for standardized protocols to ensure reliable and reproducible olfactory assessments.