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Panel Screening Test

And the "Triangular Odor Bag Method," those who judge the presence or absence of the odor are called the “panel”. In this method at least six panel members with normal olfaction are required. Therefore, we start with conducting the aptitude test to select the panel.

Five Standard Odors

There are five standard odors used in the test.

A. β (beta)-phenylethyl alcohol (a flowery smell)

B. Methyl cyclopentenolone (a sweet burning smell)

C. Isovaleric acid(a smell of sweaty socks)

D. γ-Undecalactone(a peachy smell)

E. Skatole (a moldy smell)


These standard odors are reagent used in determining disorders of the nose, such as olfactory blindness. The distribution of odor threshold values for the people with normal olfaction and those with hyposmia has been studied for each of the odor. The concentration of each standard odor is set to see if the person has normal olfaction and can pass the test. Those who select all standard odors are qualified as panel.


The test is called the two-fifth test. Three of the five smelling strips are soaked in odor-free liquid paraffin; the remaining two strips are applied with the same standard odor and are given to the examinee to have them smell. This determines whether the examinee can correctly select the numbers of the two smelling strips with the standard odor. The two out of five strips are with odor .The remaining 3strips are soaked in the odor-free liquid paraffin.


The test is conducted in the following procedure. Prepare 5 strips, and put the number from 1 to 5 on each strip.Use clips or holders to hold the strips.


Select 3 strips randomly, and soak them in odor-free paraffin. Soak the strips about 1 cm from the edge. Apply the same standard odor to the 2 strips. Record the numbers selected.


Give the examinee the 5 strips prepared in this way.The examinee sniffs each strip, and select the one with odor.


The examinee writes down the numbers of the two smelling strips.The numbers are compared to the recorded numbers, When the two numbers match, the examinee is determined as having normal sense for that particular standard odor.


The examinee is tested with five types of standard odor. If the examinee can pick up the right number at each 5 test, the examinee is judged to be qualified as the panel.The passing rate is about 90%; Those under40 years of age are retested every 5 years, and those over 40 are retested every 3 years.


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