a desert in NW India and S Pakistan. About 77,000 sq. mi. (200,000 sq. km). Also called Great Indian Desert.
HIV tests are used to detect the presence of the human immunodeficiency virus (HIV), the virus that causes acquired immunodeficiency syndrome (AIDS), in serum, saliva, or urine. Such tests may detect antibodies, antigens, or RNA.
Although most HIV tests look for these antibodies, some look for the virus itself. The period after infection but before the test becomes positive is called the window period. Deciding when to get tested therefore depends on when you may have been exposed and which test is used.You can ask your health care provider about the window period for the HIV test you are taking. If you are using a home test, you can get that information from the materials included in the packaging of the test.lthough most HIV tests look for these antibodies, some look for the virus itself. The period after infection but before the test becomes positive is called the window period. Deciding when to get tested therefore depends on when you may have been exposed and which test is used.