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The tests commonly used to detect HIV infection actually look for >antibodies produced by your body to fight HIV. RNA tests look for genetic >material of the virus and can be used in screening the blood supply and for >detection of rare very early infection cases when antibody tests are unable >to detect antibodies to HIV. Acute (sudden start) HIV infection can be >diagnosed by detecting HIV RNA in plasma from persons with a negative or >indeterminate HIV antibody test.>>According to the Revised Recommendations for HIV Testing of Adults, >Adolescents, and Pregnant Women in Health-Care Settings, when acute >retroviral syndrome is a possibility, a plasma RNA test should be used in >conjunction with an HIV antibody test to diagnose acute HIV infection.>>Most people develop antibodies within 2 to 8 weeks. The average is 25 days. >Ninety-seven percent will develop antibodies in the first 3 months. In rare >cases, it can take up to 6 months.>>During the time between exposure and the test, it is important to avoid any >behavior that might result in exposure to blood, semen, or vaginal >secretions.>>Knowing your status allows you to receive appropriate care and to avoid >infecting others. It is never too late to test and know your status.>>To find out when you should be tested, discuss it with your testing site >staff or personal physician.>>For more information about HIV testing, please visit the CDC website:>

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