A Pilot Study of the Snap & Sniff Threshold Test.

Objectives:The Snap & Sniff® Threshold Test (S&S) has been recently developed to determine the olfactory threshold. The aim of this study was to further evaluate the validity and test–retest reliability of the S&S.Methods:The olfactory thresholds of 120 participants were determined using both the Smell Threshold Test (STT) and the S&S. The participants included 30 normosmic volunteers and 90 patients (60 hyposmic, 30 anosmic). The normosmic participants were retested using the STT and S&S at an intertest interval of at least 1 day.Results:The mean olfactory threshold determined with the S&S was −6.76 for the normosmic participants, −3.79 for the hyposmic patients, and −2 for the anosmic patients. The olfactory thresholds were significantly different across the 3 groups (P < .001). Snap & Sniff–based and STT-based olfactory thresholds were correlated weakly in the normosmic group (correlation coefficient = 0.162, P = .391) but more strongly correlated in the patient groups (hyposmic: correlation coefficien...