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Originally Posted by Fran
the positive predictive value of an in-practice test for FeLV antigen is quite low, to the extent that more than half of positive results are false positives. This is especially important if a positive result is found in a healthy cat. Therefore it is strongly recommended that a positive screening test should be confirmed by another test, such as immunofluorescence or virus isolation.
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OMG - I didn't realise it was such a high statistic. My vet did tell me that false positives happen on in-house tests, but that there are never really false-negatives, unless the test is done too soon. Which is why I have to wait to have Lily tested.
