GSI AudioStar Pro™ Clinical Audiometer
74
D-0100778 Rev C
Threshold Determination (Pure Tone): Modified Hughson-Westlake
Present the tone at 50 dB.
Present the tone for 1 or 2 seconds. The time between the tones should
vary, but should not be shorter than the test tone.
With each response, decrease the tone 10 dB until the first “No
Response” occurs.
When the subject does not respond to a tone, increase the intensity by 5
dB until a response occurs.
Continue with
DOWN
10 dB,
UP
5 dB until the threshold is reached.
NOTE: Threshold = minimum dial setting at which a response has occurred 2
times out of 3 on an ascending scale
.
The threshold is considered to be the minimum intensity setting at which
a response has occurred two out of three times at lowest db HL. Record
this setting by pressing Store.
Repeat the sections on Patient Familiarization and Threshold
Determination for each tone setting in the following order: 1,000 Hz,
2,000 Hz, 4,000 Hz, 8,000 Hz. Retest 1,000 Hz followed by 500 Hz and
250 Hz. If there is a difference of 20 dB or greater between octaves, test
the inter-octave frequencies, i.e. 750 Hz, 1,500 Hz, 3,000 Hz, and 6,000
Hz. Record these settings by pressing the Store pushbutton with each
threshold level.
Repeat this procedure with the other ear.
Determine if masking should be used. If necessary, repeat the testing
with masking and again record the testing process.
