I don't know if you would call it a false negative.  It is possible for a cat 
to be so recently exposed to the FeLV virus that it will not show up on the 
test.  That's why many recommend retesting a few weeks later.

 From: Marcia <marciabmar...@gmail.com>
To: "felvtalk@felineleukemia.org" <felvtalk@felineleukemia.org> 
Sent: Wednesday, January 4, 2012 6:07 AM
Subject: Re: [Felvtalk] Idexx combo tests

Are these normally just inaccurate as far as false positives go? Are there ever 
any false negatives?

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