Operating Instructions
65
The required compliance change of 0.05 ml is an industry standard default for impendence
systems with automated acoustic reflex measurement and has been verified via real-ear testing
with the ERO-SCAN Pro to result in comparable pass/refer results to existing clinical standard
equipment (Grason-Stadler, 2005; Interacoustics, 2007; Interacoustics, 2011; Maico, 2005; and
Maico, 2011).
A correct interpretation of the measuring results can only follow in connection with the
tympanogram, the graphic reflex display and other actual data. But in principle a Stapedial
reflex indicates that the patient hears on the “stimulus ear” and that the sound lead on the
“probe ear” functions.
It is for these reasons that acoustic reflex measurements are not used in isolation to diagnose or
screen for pathologies of the middle ear system, but rather are considered with additional
audiological measures, such as Otoacoustic Emissions and Tympanometry measurements as
part of a diagnostic or screening battery.
Note: The limits selected are intended to separate normal ears from significantly
abnormal ears across most populations.
Users with the goal of detecting mild conditions should ensure that appropriate age related
norms are used in setting Pass/Refer criteria.
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