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Audiometric Masking - Interacoustics
https://www.interacoustics.com/guides/test/audiometry-tests/audiometric-masking
(1) In case of an air-bone gap of 15 dB or more, you must reassess the bone conduction threshold while applying masking to the non-test ear. (2) If the difference between the air conduction threshold in the poor ear and the bone …
MASKING IN PURE TONE AUDIOMETRY - ENT Lectures
http://entlectures.com/Resources/Dialogs/Dialogue%20with%20the%20ENT%20Residents_Masking%20in%20pure%20tone%20audiometry.pdf
In bone conduction pure tone audiometry masking for bone conduction assessment is required when there is a gap at any frequency of 15dB or more between the unmasked bone conduction result and the air conduction threshold. This is known as the air-bone gap. Masking in bone conduction testing The same method is used as for air conduction.
How to Perform Masking in Audiology
https://blog.emoyo.tech/content/masking-in-audiology
To mask the non-test ear, add 10 dB HL to the air-conduction threshold in the non-test ear (air conduction non-test ear + 10 dB HL). For effective masking, start at this level. Bone-conduction testing. By this time, you may have realised the audiometric tester should always mask if the interaural attenuation for bone conduction is ~0 dB.
Audiometric Symbols - ASHA
https://www.asha.org/policy/GL1990-00006/
The brow for sound field and unmasked bone conduction symbols should be attached at the bottom and drawn straight downward. The "no response" symbol should be placed on the audiogram at the HL representing the maximum output limit for specific frequencies, transducers, and audiometers. Each of the "no response" symbols is shown in Table 2.
Clinical Masking for Audiometric Testing in Adults - cshbc.ca
http://cshbc.ca/wp-content/uploads/2019/03/CSHBC-PROT-QA-03-Clinical-Masking-for-Audiometric-Testing-in-Adults.pdf
Contralateral masking is indicated during speech audiometry whenever the presentation level of the speech signal (in dB HL) in the test ear (Presentation Level test ear) equals or exceeds the best pure tone bone-conduction threshold in the nontest ear (Best BC Nontest Ear) by a conservative estimate of IA. (Yacullo, 2000, p. 88)
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