The candy smell test: a new test for retronasal olfactory performance

Area of Science:

• Olfactory research
• Sensory science
• Clinical audiology

Background:

• Olfactory dysfunction affects quality of life and can indicate underlying neurological conditions.
• Existing olfactory tests may not be suitable for children or are time-consuming.
• A need exists for a reliable, user-friendly olfactory test for diverse age groups.

Purpose of the Study:

• To develop and validate the Candy Smell Test (CST) for assessing retronasal olfaction in children and adults.
• To determine the minimum age for reliable olfactory testing.
• To compare CST performance against the established "Sniffin' Sticks" test.

Main Methods:

• A randomized, three-way crossover study involving 353 healthy participants (230 children, 123 adults).
• The Candy Smell Test (CST) uses 23 flavored sorbitol candies in a forced-choice format.
• Comparison with the "Sniffin' Sticks" test in 124 patients with olfactory disorders.

Main Results:

• The CST demonstrated good test-retest reliability (r=0.75).
• CST scores strongly correlated with "Sniffin' Sticks" scores (r=0.84), with CST being easier to administer.
• The minimum age for valid testing was 7 years for both methods.
• The CST achieved 94% sensitivity and 83% specificity in detecting anosmia.

Conclusions:

• The Candy Smell Test (CST) is a reliable, fast, and easy-to-use tool for screening olfactory function.
• CST is suitable for children aged 7 years and older, as well as adults.
• This test aids in the diagnosis of smell impairment in clinical settings.