If the feline leukemia test is positive, your veterinarian will likely follow up with more definitive testing using a immunofluorescence assay (IFA).
The IFA test looks specifically at the white blood cells for the antigen and therefore gives a more definitive diagnosis of the disease.
Should the ELISA and IFA test give conflicting results, the PCR test offers a way for your veterinarian to diagnose feline leukemia.
Indirect immunofluorescent antibody assay (or IFA) test can only find the secondary stage of the virus.
The IFA test is definitive, but it's not as sensitive as the ELISA test.
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