TM 262
1-10 Revised 4/11/08
Glossary of terms
Tympanometry - an objective measurement of middle-ear mobility and middle-ear pressure
through the use of a low frequency sound (probe tone) and air pressure changes.
Tympanogram - the tracing which depicts the results of tympanometry.
Compliance Peak - the point of maximum mobility in a tympanogram which indicates the
degree of mobility within the middle-ear system.
Pressure Peak - pressure value where maximum mobility occurs in a tympanogram. This
pressure value approximates the pressure within the middle-ear space.
Normal Box - range of pressure peak and compliance peak values associated with normal
middle-ear function. (-150 daPa to +100 daPa, 0.2 cm
3
to 1.4 cm
3
per ASHA, 32, Supl. 2, 1990,
17-24).
Ear Canal Volume - volume measured between the tip of the probe and the tympanic
membrane at the starting pressure for a tympanogram.
Probe Tone - low pitch (226 Hz) tone used to measure middle-ear mobility.
Acoustic Reflex - reflex arc elicited in the presence of very loud sounds which cause a decrease
in middle-ear compliance as a protective mechanism for the cochlea.
Ipsilateral Acoustic Reflex - the acoustic reflex elicited when the stimulus is presented to the
same ear where the response is measured.
Manual Threshold Audiometry - a hearing test performed with a variety of frequencies and
intensities without the use of masking to determine if an individual can hear.
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