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Acceptable Noise Level (ANL) Test

As part of hearing assessments or as requested by physicians we are able to conduct a wide variety of subjective and objective clinical audiological tests for adults and children.

Objective Tests

Objective tests are tests which are conducted without the active participation of the patient. Some of these tests are especially useful to test young children who cannot correctly respond or uncooperative adults.

Impedance Audiometry

Impedance Audiometry

This is used to checking the status and the function of the middle ear. This is very important as all future tests rely on a normally functioning middle ear. There are three main tests. The most commonly used test is check the function of the eardrum and the air pressure in middle ear cavity. Another test is the stapedius reflex test. This test measures the contraction of the stapedius muscle in the middle ear. This muscle automatically contracts in the presence of loud sounds to protect the inner ear.

The test is conducted by sealing off the earcanal airtight with a probe. By varying the air pressure in the earcanal the resistance of the eardrum to the pressure can be measured, which allows pressure in the middle ear cavity.

To measure the stapedius reflex the probe products a gradually louder sound until the muscle contraction can be measured on the eardrum which gets more resistance to the probes air pressure.

Subjective Tests

Subjective tests are test where the patients response is used to record a test result.

Acceptable Noise Level (ANL) Test

Acceptable Noise Level (ANL) Test

This is one of the most important tests to evaluate necessary hearing aid technology and success with hearing aids.

You will listen to someone reading you a story at a comfortable loudness. Some noise will be added. The noise will be gradually increased, until you feel uncomfortable and unable to follow the story easily. The difference in loudness between the voice and the noise is your ANL. The lower the ANL the less sensitive you are too noise. The higher the ANL the more sensitive are you to noise.

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