Indoor cats should be tested for these diseases at least once in their lifetime. FIV/ FELV are two different autoimmune diseases cats can get from other cats. Some do not have many symptoms other then they get sick a lot due to their weakened immune system, while others can get extremely ill. Checking for these diseases will help us better treat the pet when he/she gets sick and help make recommendations to keep them healthy. Kittens should be tested for FELV at their first visit, but CANNOT be tested for FIV until they are 6 months of age. If the test is done early, you can get a false positive or a false negative. To ensure the test is truly negative a confirmatory test should be performed 60 days after the last known exposure to these diseases.