Gap between odor perception threshold and identification threshold: Calculation based on a graph of the Biolfa(®)...

Area of Science:

• Neuroscience
• Olfactory Research
• Medical Diagnostics

Background:

• Olfactory disorders have diverse etiologies, complicating diagnosis.
• Quantitative assessment of olfactory function is crucial for understanding disease mechanisms.
• The Biolfa(®) test provides semi-quantitative data on odor perception and identification.

Purpose of the Study:

• To develop a graphical representation of Biolfa(®) olfactory test data.
• To mathematically quantify the gap between odor perception and identification thresholds.
• To assess the diagnostic utility of this gap measurement for olfactory disorders.

Main Methods:

• Utilized semi-quantitative Biolfa(®) olfaction test data from 158 patients.
• Employed a radar-like diagram to display perception and identification thresholds for eight smells across four concentrations.
• Quantified the gap as the area between perception and identification threshold curves.

Main Results:

• The calculated gap between thresholds differentiated between peripheral and central origins of olfactory disorders.
• A smaller gap (0–82.73 cm²) correlated with peripheral olfactory disorders, while a larger gap suggested central origins (p>0.05).
• No specific olfactory profile was identified for individual etiologies of olfactory disorders.

Conclusions:

• A radar graphic display of Biolfa(®) data offers a simplified overview of olfactory function.
• Quantifying the gap between perception and identification thresholds is valuable for diagnosing central olfactory disorders.