Interacoustics Affinity2.0 Quick Manuals page 39

Quick Guide –
Introduction
This Quick Guide is intended to provide information at a beginner level to assist the reader in their
understanding of Real Ear Measures (REM). It will also explain some of the common terminology used for REM
2
and Callisto™ software.
and within the Affinity
Why perform Real Ear Measures?
Not all hearing losses can be resolved by the same method, there are often many differences in the type of
Hearing Devices they are prescribed, the patient's unique ear canal acoustics and the method in which the
Hearing Device is passing sound into the ear. Real Ear Measures help to overcome these differences by
allowing the Audiologist to objectively measure and verify the sound that is being delivered at the ear drum.
The benefits of this process can be applied in varying scenarios from initial hearing aid fitting to troubleshooting.
As a consequence, performing this method can help to gain better satisfaction from your patient from their first
fitting and less follow up appointments.
REM can only be performed for Hearing Devices which deliver sound via an Air-Conduction method and not for
devices which deliver sound via Bone-Conduction or Electrophysiological stimulation.
REM can be performed via three methods, Real Ear Insertion Gain, Real Ear Aided Gain and Real Ear Aided
Response. All three achieve the same objective in fitting the hearing aid for the patient and they are all equally
as efficient as one another. It is just a preference of which method is used.
What is the basic process of REM?
REM mainly involves placing a fine probe microphone into the ear canal to measure the sound at the ear drum.
These measures include the response of the ear canal acoustics and the hearing aid and can help the clinician
to adjust the hearing device specifically to the patients' ears.
The REM process usually involves the following steps once hearing assessment has been performed.
1. Calibration of the Probe Microphone – this step can be performed without the patient being present and
involves aligning the external microphone with the probe microphone to compensate for any differences
between the two. A stimulus is then played and a trace will appear onscreen similar to below.
Item No. 8105087 – 12/2013
A Beginners Guide to Real Ear
Measures (REM)
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