How Is Cat Leukemia Diagnosed? If your veterinarian suspects your cat has FeLV, they can be screened through a simple ELISA snap blood test. If your veterinarian uses a reference laboratory, snap test results can be available within 24 hours.
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The leukemia virus attacks the cats blood cells by invading tissue that makes up the blood cells, including bone marrow and lymph tissue. Blood cells (red blood cells, white blood cells, and platelets) play an important role in keeping the body supplied with oxygen and nutrients.

Prolonged secondary infections (for example, upper respiratory infection that doesnt go away). Diagnosing Feline Leukemia Virus in Cats. Cat having a blood test at the vet. FeLV is initially diagnosed with a simple blood test at your veterinary hospital.