I don't know how or if this will address your question but at the sanctuary I was involved w/ we always used Elisa first..... Then, If" we got positive results on Elisa, we always retested w/ IFA. And, any cat "in question" was always kept in isolation no matter what the IFA results were. And, then, we always re-tested, again, w/ IFA. We always believed IFA to be the most accurate, and, yes, costly...... If the 2nd IFA came back +, then we did home those babies in our Felv area[s]. If negative, baby was put up for adoption [w/ ALL vet history given]. And no matter what the results were, I'm just happy those babies had a "home for life". Be it adoption or life at the farm....... Don't know if this helps any, but just wanted to share my "history" w/ IFA testing.... Hugs, Patti & her gang
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