-p24 antigen and 4th generation HIV ELISA tests help detect early HIV infection after exposure -p24 antigen appears earlier than antibodies in the blood

P24 antigen/4th generation HIV ELISA (antigen + antibody) can start detecting infection usually from around 2–4 weeks after exposure, with most cases detected by 4 weeks. A negative 4th generation test at 6 weeks is highly reassuring, and at 12 weeks is considered conclusive in most guidelines. If you are asking specifically about p24 antigen alone, it is generally detectable around 14–28 days after exposure.

28 days to 3 months

It is considered highly reliable from around 28 days after exposure, with final confirmation commonly advised at 45 days to 3 months depending on the situation and testing method.

The p24 antigen ELISA test (part of the 4th generation Duo/Combo tests) is one of the earliest ways to detect an HIV infection. The p24 antigen is a viral protein that appears in the blood before antibodies are even formed. While it can sometimes be detected as early as 2 weeks, the detection window for most modern immunoassay methods is generally 18 to 45 days after exposure. Testing too early can lead to a 'false negative' because the viral load might not be high enough yet."

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P24 antigen: 14-15 days Dot immunoassay : variable depending on kit

Do consult

Sure

28 days or may be 3 months

Can help you, kindly consult and provide detailed history for proper diagnosis and further management