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Confirming the test result (i.e., by repeating the test, if this option is available) could reduce the ultimate likelihood of a false positive to about 1 result in 250,000 tests given. The sensitivity rating, likewise, indicates that, in 1,000 test results of HIV infected people, 3 will actually be a false negative result.
An HIV antibody test usually detects the HIV antibodies within two to eight weeks, but can have a valid negative result for a long as 2 to 6 months after initial infection. Viral load tests can also be used to diagnose HIV infection, especially in children under 18 months born to mothers with HIV, where the presence of maternal antibodies ...
Stage 0: the time between a negative or indeterminate HIV test followed less than 180 days by a positive test; Stage 1: CD4 count ≥ 500 cells/μL and no AIDS-defining conditions; Stage 2: CD4 count 200 to 500 cells/μL and no AIDS-defining conditions; Stage 3: CD4 count ≤ 200 cells/μL or AIDS-defining conditions
VCT has become popular in many parts of Africa as a way for a person to learn their HIV status. VCT centers and counselors often use rapid HIV tests that require a drop of blood or some cells from the inside of one's cheek; the tests are cheap, require minimal training, and provide accurate results in about 15 minutes. [citation needed]
The window period for HIV may be up to three months, depending on the test method and other factors. RNA based HIV tests has the lowest window period. Modern and accurate testing abilities can cut this period to 25 days, 16 days, or even as low as 12 days, again, depending on the type of test and the quality of its administration and interpretation.
The latest recommendations of the US Centers for Disease Control and Prevention (CDC) show that HIV testing must start with an immunoassay combination test for HIV-1 and HIV-2 antibodies and p24 antigen. A negative result rules out HIV exposure, while a positive one must be followed by an HIV-1/2 antibody differentiation immunoassay to detect ...
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