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The Red Cross is also a leader in research and testing to protect the safety of the blood supply. We were among the first to develop and implement testing for many infectious diseases including, HIV, hepatitis B and C viruses, West Nile virus, and more recently the agent of Chagas disease.
A series of blood screenings are performed to test for HIV. The enzyme-linked immuno assay (ELISA or EIA) is the first test that your doctor will order to screen for HIV. ELISA and the Western blot test detect HIV antibodies in your blood.Antibodies are proteins your immune system produces in response to the presence of foreign substances such as viruses.If you test positive for HIV on the ELISA test, your provider will order the Western blot test to confirm HIV infection.f you test positive on the ELISA screen, your doctor will order a Western blot test. If you test positive for HIV with the Western blot test, you probably have HIV. Sometimes, HIV does not show up on the ELISA test even though you are infected.