Hi Melissa,
At the sanctuary where I work, all Felv cats are tested with both SNAP and IFA tests. And because of that, we occasionally get a few cats that test faint positive in the SNAP and negative for the IFA. Then they go home with me, because they're kind of in limbo. That's why I joined this list: I'd like to know if anyone else has a bipolar cat, as they call them, and what to expect regarding life expectancy, etc.
Anyway, with regard to your cat, I'd go for the IFA test, just to be sure. It would be good to know your cat is completely negative (and cause for major congratulations). Is she a young cat? Sometimes they seroconvert in the first 18 months. It's supposed to be rare, but I've seen it happen.
Laura
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