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Pure-tone audiometry is the main hearing test used to identify hearing threshold levels of an individual, enabling determination of the degree, type and configuration of a hearing loss [1] [2] and thus providing a basis for diagnosis and management.
A tone at the frequency of 4000 Hz is presented for 60 seconds at an intensity of 5 decibels above the patient's absolute threshold of hearing. If the patient stops hearing the tone before 60 seconds, the intensity level is increased by another 5 decibels with the procedure repeated until the tone can be heard for the full 60 seconds or until no decibel level can be found where the tone can be ...
[1] [2] Hearing diagnosis using mobile application is similar to the audiometry procedure. As a result of hearing test, hearing thresholds at different frequencies are determined. Despite the errors in the measurements, application can help to diagnose hearing loss. [1] Audiogram, obtained using mobile application, can be used to adjust hearing ...
The result of the test is an audiogram diagram which plots a person's hearing sensitivity at the tested frequencies. On an audiogram an "x" plot represents the softest threshold heard at each specific frequency in the left ear, and an "o" plot represents the softest threshold heard at each specific frequency in the right ear.
A pure tone audiometry hearing test is the gold standard for evaluation of hearing loss or disability. [medical citation needed] Other types of hearing tests also generate graphs or tables of results that may be loosely called 'audiograms', but the term is universally used to refer to the result of a pure tone audiometry hearing test.
Otosclerosis results in an audiogram with significant loss at all frequencies, often of around 40 dB(HL). [12] A deficiency particularly around 2 kHz (termed a Carhart notch in the audiogram) is characteristic of either otosclerosis or a congenital ossicular anomaly. [13] Ménière's disease results in a severe loss at low frequencies. [14]
Apart from the already mentioned anticipation and habituation, stimulus persistence (preservation) could influence the result from the method of adjustment. In the descending runs, the subject may continue to reduce the level of the sound as if the sound was still audible, even though the stimulus is already well below the actual hearing threshold.
A negative Stenger result indicates that the patient responded to the signal presented to the better ear, indicating an organic asymmetric hearing loss. A positive Stenger result indicates that the patient did not respond even though the signal was 10 to 20 dB above the better ear, indicating a non-organic hearing loss. [4]