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What is In Bing test, on alternately compressing and releasing the external acoustic meatus, the sound increases and decreases. What does this indicate? and explain in detail?
Bing test It is a test of bone conduction which examines the effect of occlusion of the ear canal and the hearing. A vibrating tuning fork is placed on the mastoid while the examiner alternately closes and opens the ear canal by pressing on the tragus inwards. A normal person / one with sensorineural hearing loss hears louder when ear canal is occluded and softer when the canal is open. A patient with conductive hearing loss will appreciate no change.