Chapter 4 - Special Test Procedures
Aided Test
The following aided tests are then performed for comparison.
1
. Obtain an aided Speech Reception Threshold in the sound field room with the patient
wearing the hearing aid to be evaluated.
2
. The attenuator for the channel routed to the aided ear should be set to 40 dB HL (comfort
setting).
3
. Instruct the patient to turn up the volume of the hearing aid until the tester’s voice is
comfortably loud. Hearing aid volume should remain at this setting throughout the test.
4
. Present spondees, beginning at the 40 dB setting and attenuating the intensity until the
aided threshold is reached.
5
. The aided discrimination score can then be obtained by initially setting the intensity to 30
to 40 dB above the aided threshold. The hearing aid’s volume should be set for a 40 dB HL
speech input.
6
. Obtain aided measurement of discomfort or tolerance limits with the same gain control
setting.
7
. The measurement of efficiency in noise can be determined.
a. Set the hearing aid gain for a 50 dB HL speech input level.
b
. Present word discrimination material at 50 dB HL through Channel 1 to the
aided test ear.
c. Route speech or white noise to the aided test ear through Channel 2.
d
. Increase the noise gradually until the words can no longer be repeated.
8
. Continue comparative tests with each hearing aid in evaluation.
4-7
1761-0100 Rev. B
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