Asthenosphere Asthenosphere, Layer beneath the lithosphere. The asthenosphere is the layer of our planet that lies beneath the lithosphere. It was first named by J. Barrell, a British geologist when he divided the interior of the Earth into three parts. The lithosphere is the outer layer of the Earth that contains crustal plates.
It is wise, however, to have the test repeated by a different laboratory using a different technique (Western Blot). Mother cats with FIV pass antibody to their kittens whether the kittens become infected or not. So positive test results in kittens do not mean they harbor the virus of FIV. If kittens are positive, they need to be retested every two months until they are six months old to see if the test becomes negative. If the test is still positive at six month, they probably have the disease.
Since a lot of cats will be tested who won't have the disease and only a small number of cats will be tested who do have the disease it becomes somewhat likely that a test that is positive is inaccurate. All cats should be tested at least twice when they show up positive on feline leukemia testing. The other problem is that cats can be negative on a test for feline leukemia and then become positive due to recurrence of a suppressed infection, a new infection or because of a false negative result to begin with.