The AB gaps at 500 Hz through 4000 Hz are certainly not uncommon. Of course,
the AB gap at 250 Hz of 90 dB would probably be artifact. As far as I know,
a 60 dB AB gap is the limit. But my next question is how did she use insert
earphones on someone who does not have an ear canal?
Howard N. Gutnick, Ph.D.
Atlantic Coast Ear Specialists, P.C.
Virginia Beach, Virginia
hgutnick at series2000.com
François Bergeron wrote in message ...
>A collegue audiologist recently completed an hearing exam using insert
>earphones and found an air/bone gap of 90dB at 250 Hz, 60 at 500 Hz, 55 at
>1000 Hz, 45 at 2000 Hz, 30 at 4000 Hz in a patient without any outer and
>middle ear. Being surprised by this huge air/bone gap, she would like to
>know if anybody else ever got such clinical findings.
>>François Bergeron Ph.D.