Low static admittance (Peak Y [Ya]) may or may not be associated with
significant middle ear disorders. In the absence of other positive findings,
a Peak Y (Ya) below the 90% range listed in Table 6 requires observa-
tion over an extended period before a medical referral is warranted.
Only after two successive abnormal findings over an interval of 4-6
weeks should medical referral be made.
An abnormally-wide tympanometric width (TW) may occur in the absence
of other findings in cases with otitis media. These cases may represent
transient secretory otitis media, which does not require medical referral.
Like static admittance, abnormal TW in the absence of other signs of
middle ear disorders requires a retest after 4-6 weeks, and only then
should a medical referral be based on this finding alone.
Audiologic or Medical Referral
Failure of the screen should result in an audiologic evaluation and medical
examination. The nature of the referral may depend upon the characteristics
of the screening program and the availability of services. For example, the
referral may be to a clinic that provides both audiologic and medical services.
Alternatively, an audiologic referral may precede the medical referral. If audio-
logic services are not available, an immediate medical referral should be
made upon failure of the screening protocol.
Table 6
Peak Y [Ya] Vec [Vea] TW
(mmho or cm
3
) (cm
3
) (daPa)
Mean 90% Mean 90% Mean 90%
Range Range Range
Children 0.5 0.2 to 0.9 0.7 0.4 to 1.0 100 60 to 150
Adults 0.8 0.3 to 1.4 1.1 0.6 to 1.5 80 50 to 110
B-42
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