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Audiological Test

Selection of Hearing Aids

Audiological Test

  • Puretone Audiometry
  • Impedance Audiometry
  • Speech Audiometry
  • Speech In Noise (SPIN) Test

This test is the basic and most important in audiology. It helps measure your degree of hearing loss or hearing problem. Here, air conduction (AC) and bone conduction threshold (BC) or lowest hearing ability is measured in various frequencies (generally between 250 Hz–8Kz). Depending on the difference of AC and BC, the type of hearing loss (conductive, sensorineural and mixed) is determined.

This test helps understand middle ear functions as well as identifies any problem therein.

In speech audiometry, we generally perform two tests simultaneously, namely SRT (speech reception threshold) and SDS (speech discrimination score). SRT helps to realize the lowest level of intensity, where an individual can identify speech and SDS represents the percentage of speech understanding at comfortable level of listening.

Speech discrimination is 90–100% for normal and conductive hearing loss, but for SNHL, speech discrimination score gradually goes down.

This test helps analyze a person’s speech discrimination or ability to understand speech according to various noise levels. We hear amid other unwanted sounds in our daily life. Hence, this test determines whether we are facing any problem understanding speech on a daily basis.

  • B.O.A.
  • Otoacoustic Emission
  • ABR/BERA
  • ASSR

This test helps determine and get an idea about hearing problems in children aged 0–3 years.

This advanced test is generally done for children. Its use is very important for newborn hearing screening. In case of screening, whether outer hair cells are working or not are verified via pass or refer test result. Hence, when a child passes the screening test, he/she is declared as ‘passed’ and in case of ‘fails’, they are referred to a hearing specialist. Although, the usage of this test is high for children, it can be used for differential diagnosis in case of adults.

ABR/BERA (Auditory Brain-Stem Response)

This is an automatic electro-physiological test. In this test, in the presence of sound or during the course of sound, outer electrodes are used to measure cochlear nerve and electric activity of brain stem. We get to know few facts by analyzing this activity –

Threshold estimation – lowest level of audibility.

Neuro-diagnosis – which determines whether there are any problems with the auditory nerve.

ASSR (Auditory Steady States Response)

This is an automatic electro-physiological test determining extent of threshold or least hearing ability according to frequency. Generally, this test is done between 500Hz to 4Kz frequencies. The correlation of ASSR with behavioral audiogram (which is found from Puretone Audiometry) can be easily understood. Hence, many times this test is also known as physiological audiogram.

  • ENG/VNG/VEMP

These are separate tests determining balance disorders.

  • ECochG

This test is also a cochlear function test especially done to determine Meniere’s disease. For adults, the first 4 tests for hearing aid selection are extremely important and generally, hearing aids are selected based on these 4 tests. However, before selecting hearing aids, we’ll discuss an important component that will assist you in the best selection.

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