PE tubes and impedance

[Hogwild]

Hello, I've got a question for you audiologists out there.  What is your
opinion on performing impedance testing on children with PE tubes?  I've
heard that it's fine, you'll just see a type B tymp and a greater physical
volume.  However, I've also heard you risk moving or "dislodging" the tubes
and it shouldn't be done.  Any information or insight would be appreciated.
Thanks,
C. Hoge

I posted this yesterday and hadn't seen it, so if this is redundant, my
apologies.