How Many Weeks After Possible Exposure Elisa Generation Test Is Conclusive For Negative Result?

Posted on Thu, 21 Nov 2013

Medically reviewed by Ask A Doctor - 24x7 Medical Review Team

Thu, 21 Nov 2013 Answered on

Tue, 10 Dec 2013 Last reviewed on

Question : At how many weeks after a possible exposure, the Elisa 4 th generation test (Hiv 1,2 +p24) is considered conclusive for negative result

Answered by Dr. Sankaranantham Murugan (42 hours later)

Brief Answer: Moreconfirmatory after 4weeks of highrisk activity Detailed Answer: Hi, Welcome to XXXXXXX Thanks for posting your query. Elisa 4th generation is a combo test picks up both antigen and antibodies against HIV and highly reliable. P24 Antigen appears as early as 1 week itself, it becomes more conclusive after 4 weeks of possible infection. Antibodies against HIV 1&2 will take 8-12 weeks to appear (window period). But this test, if done after 3 weeks of high risk activity, it either confirms or rules out the infection with certainty. Dr S.Murugan

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar