A Pilot Study of the Snap & Sniff Threshold Test

Ann Otol Rhinol Laryngol. 2018 May;127(5):312-316. doi: 10.1177/0003489418760055. Epub 2018 Feb 24.


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 coefficient = 0.376, P = .003; anosmic: correlation coefficient = 1.0). The test-retest correlation for the S&S-based olfactory thresholds was 0.384 ( P = .036).

Conclusion: Based on validity and test-retest reliability, we concluded that the S&S is a proper test for olfactory thresholds.

Keywords: Smell Threshold Test; Snap & Sniff Threshold Test; olfactory threshold test; reliability; test–retest; validity.

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Case-Control Studies
  • Female
  • Humans
  • Male
  • Middle Aged
  • Olfaction Disorders / diagnosis*
  • Pilot Projects
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Sensory Thresholds / physiology*
  • Smell / physiology*
  • Young Adult