Welch Allyn MicroTymp 3 portable tympanometric instrument - User Manual - Manual (Page 38)

38 Interpreting test results Welch Allyn MicroTymp3 portable tympanometric instrument
Normative values
The table below presents normative values for 1000-Hz tympanometry for NICU babies
and full-term 2- to 4-week-old babies. [Margolis, R.H., Bass-Ringdahl, S., Hanks, W.D.,
Holte, K., Zapala, D.A. Tympanometry in Newborn Infants - 1 KHz Norms. J. Amer. Acad.
Audiol., 14, 383-392, 2003.]
Interpreting 1000-Hz results
Pass
A normal tympanogram will yield a PASS result. The displayed numerical value represents
the compensated admittance.
Condition which causes a PASS message:
• Peak Ya greater than or equal to 0.6 mmho
Normative tympanometric values (1000 Hz)
Tympanometric Measurement NICU
90% Range Full-term
90% Range
Peak Ya
(Negative Tail Compensation) 0.6 - 2.7 mmho 0.6 - 4.3 mmho
Tympanometric
Peak Pressure (TPP) -93 - +53 daPa -133 - +113 daPa
-400 -200 0 200
2
0.5
0
1.0
1
GR
A
GR
C
PRESSURE - daPa
Ya - mmho
+200 Vea - cc