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Can someone say p24 antigen Elisa test at which date to be able to detect after exposure...dot immonousaasy method how much day after exposure
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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.
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28 days to 3 months
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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.
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28 days or may be 3 months
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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."
Next Steps
Recommended Timeline: "For the most reliable results using a 4th generation test, it is best to test at 4 weeks (28 days) post-exposure. A result at this stage is highly conclusive (around 95%+ accurate)."
Confirmatory Testing: "As per standard medical guidelines, a follow-up test at 90 days (3 months) is recommended to 100% rule out the infection and account for the full 'window period'."
Health Tips
Consultation: "To discuss your specific risk level, symptoms, and to get a formal lab referral for the correct generation of tests, Book a full consultation session via my Practo profile."
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Dr. Utkarsh Mittal
General Physician
3 yrs exp
Delhi
P24 antigen: 14-15 days
Dot immunoassay : variable depending on kit
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Dr. Suraj Sharma
General Practitioner
4 yrs exp
Jaipur
Do consult
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Dr. Ravi Kumar Nadella
General Physician
18 yrs exp
Hyderabad
Sure
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Dr. Anuj Mothsra
General Physician
6 yrs exp
Jhunjhunu
Can help you, kindly consult and provide detailed history for proper diagnosis and further management
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