Welch Allyn MicroTymp 3 portable tympanometric instrument - User Manual - Manual (Page 39)

Directions for use Interpreting test results 39
Refer
Condition which causes a REFER message:
• Peak Ya is less than 0.6 mmho
Infants with middle ear effusion have lower Peak Ya at 1000 Hz, just as older children have
reduced Peak Ya at 226 Hz. When the Peak Ya is less than 0.6 mmho, the test is indicative
of abnormal middle ear function, most commonly middle ear effusion.
Retest
Note You may choose to retest the patient to confirm a REFER result.
-400 -200 0 200
2
0.5
0
1.0
1
GR
A
GR
C
PRESSURE - daPa
Ya - mmho
+200 Vea - cc
Note Certain testing or patient conditions may cause inconclusive results, yielding a
RETEST message on the display. You may interpret a series of RETEST results as
a REFER result.
-400 -200 0 200
2
0.5
0
1.0
1
GR
A
GR
C
PRESSURE - daPa
Ya - mmho
+200 Vea - cc