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ABR & ASSR

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.

ABR & ASSR

ABR & ASSR

Like a pure tone audiogram, an ABR or ASSR is used to verify the overall function of the peripheral auditory system. Additional it can be used to evaluate the maturity of auditory pathways from the ear to the Brain. The main difference and advantage over conventional audiometry is that with an ABR/ASSR one dones not require the cooperation of the patient. This makes this the preferred measurement to tests small children or otherwise uncooperative patients.

The test typically involves electrodes to be affixed to the skin on the skull where they can measure electrical activity in the brain when listening to sounds.

The test will be conducted with inserted earphones. These are small tubes connected to a loudspeaker to be inserted into the earcanal. For certain purposes the test may also be conducted in a sound field.

In case of cochlear implant users, the system can be set up to measure a signal generated by the cochlear implant.

This is extremely useful for the evaluation of cochlear implant success in instances where auditory development is not satisfactory.

Subjective Tests

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

Pure Tone Audiogram

Pure Tone Audiogram

A pure tone audiogram may be performed with Headphones or over loudspeakers in a free field.

For adults the test is most commonly performed over headphones in two parts.

The first part of the tests will start with us putting headphones on you. You are expected to indicate whenever you hear a sound, even if very faint only. The sounds will all sound differently as we will test different frequencies.

How long the test takes and how many frequencies we will test, depends on the purpose of the test and on how well you can respond.

Your ears will be tested separately. We will start with your better ear, if both ears are the same, we would typically start with your right ear.

The second part of this test is the bone conduction pure tone audiogram.

For this test we place a small vibrator or just behind your ear, on the mastoid bone.

The test will then proceed just as with headphones.

In both tests modes, you will be required to indicate when you hear a sound, which we will mark on an audiogram form. The totals of these marks will give us your pure tone audiogram for tones.

For children the same tests may be performed with the help of toys or colourful objects to enhance the cooperation of the child.

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