Understanding results. Alternative tests. The Western blot and ELISA tests are two blood antibody tests that may be used to detect HIV. In the past, the Western blot test was used to confirm the Classification of the Tuberculin Skin Test Reaction. An induration of 5 or more millimeters is considered positive in. -People living with HIV. -A recent contact of a person with infectious TB disease. – People with chest x-ray findings suggestive of previous TB disease. -People with organ transplants.
Within 2 to 4 weeks after someone gets HIV, they may have a flu-like illness, which may last for a few weeks. This is the body’s natural response to infection. This stage is called acute HIV infection. When people have acute HIV infection, they have a large amount of virus in their blood and are extremely contagious.
Urine tests take about 2 to 5 days to show a positive (you have it) or negative (you don’t have it) result. Blood tests can come back with results in a few minutes if the blood is analyzed on site.
The latest RNA/ antigen tests look for the presence of the HIV virus. They may be positive within 1-3 weeks of infection, are more expensive, offered fewer places. Antibody tests are positive more like 3-8, up 12 weeks after infection. But results can be known within 30 minutes in many cases.

Many people who have been infected with HIV are unaware that they have been infected until years after exposure to the virus. According to the U.S. Department of Health and Human Services, of the estimated 1.2 million people living with HIV in the United States, 1 in 7 do not know that they have been infected.

The p24 antigen test is accurate 11 days to 1 month after getting infected. This test is usually not used by itself to screen for HIV infection. An antibody-antigen blood test checks for levels of both HIV antibodies and the p24 antigen. This test can detect the virus as early as 11 days after getting infected. FOLLOW-UP TESTS. A follow-up test

HIV Basics. Prevention. Español (Spanish) PEP (post-exposure prophylaxis) means taking medicine to prevent HIV after a possible exposure. PEP should be used only in emergency situations and must be started within 72 hours after a recent possible exposure to HIV. This section answers some of the most common questions about PEP.

Early HIV detection is done by two means - 1. By IgM and IgG antibody and p24 antigen detection which is positive after 15 - 20 days of infection. 2. Most sensitive is HIV viral load detection which can be positive as early as 5 days. 4 th generation test is p24 plus antibody ( 1) may not be conclusive in 1 st week.
A positive HIV virologic test generally indicates HIV infection. Detectable viremia does not develop until approximately 10 to 15 days after infection, and even the most sensitive immunoassays do not give a positive result until five days after that.
The rapid test can take longer to detect HIV after exposure, from 18 to 90 days. Antibody Test : 23 to 90 Days After an Exposure: An antibody-only test uses a fluid sample swabbed from inside your An antigen/antibody test can see if you have the virus 18 to 45 days after exposure to HIV. It may take several days to get results from a traditional antigen/antibody lab test. However, rapid
HIV Incubation Period: the incubation period of HIV is between two to four weeks after being exposed to the virus. That’s when symptoms like the flu start appearing and can last for many weeks. HIV Window Period: window periods can differ between a virus to testing technique and another. An HIV antibody test would need a period of 30 to 90
A positive rapid test result requires a confirmatory HIV 1/2 Ab differentiation immunoassay. If the rapid HIV test is not available on a timely basis, PEP treatment should be started knowing that it can be stopped if the test yields a negative result.
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    • hiv test positive after how many days