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.
Types of Tests. Types of Tests. First, the lab will test your blood for HIV antibodies using a test called ELISA (enzyme-linked. immunosorbent assay). If HIV antibodies are found, we test the same sample of blood again with a test called a Western Blot to. confirm an HIV infection. It is important to know that once HIV enters the body, it takes an average of 2 to 12 weeks, or up to 6. months, for HIV antibodies to be present in the blood and show up in an HIV test.