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.
FeLV test risks. The most significant findings of the Levy study pertained to FeLV. Both the Witness and VetScan Rapid lateral flow tests demonstrated relatively poor specificity for FeLV, which means they generated false-positive results for healthy, uninfected cats. The SNAP FIV/FeLV Combo Test generated zero false-positive results. For instance, a test with 95% specificity falsely identified 5 out of 100 healthy cats as infected. This has increasing importance when screening for a disease that has a low prevalence in the population.