
What Is The Window Period For An ELFA Test?

9 days is early in your case,there are chances of false negative.
Detailed Answer:
Hello
Enzyme linked fluorescent assay(ELFA) P24 antigen test detects simultaneous both P24 antigen and antibody.This test is used in window period for screening.
Detection of P24 antigen in blood depend upon many factors like individual host response,test used,viral characteristics etc.P24 test is generally only positive from about one week to 3-4 weeks after infection with HIV.
9 days is early in your case,there are chances of false negative.I suggest repeat test after at least 2 weeks of exposure.
Initially HIV RNA appears in blood then antigen and finally antibody appears.
Viral RNA can be detected within first 2 weeks using highly sensitive RT-PCR method,so you can go for it.Otherwise you may wait for one more week.It will be more sensitive.
Test for antibodies after 12 weeks is confirmatory.
Get well soon.
Hope I have answered your query.
Further queries are most welcome.
Take Care
Dr.Indu XXXXXXX


It is nice to hear that tests are negative.You are almost safe.
Detailed Answer:
Hello
It is nice to hear that tests are negative.You are almost safe.
But we can't take chance.As we discussed earlier,production of antigen and antibodies varies with person to person.
This is the reason for repeat test at 3 weeks which almost exclude the chances of infection. CMIA is a combo test and it is almost confirmatory in 3 weeks.
We can extra precaution by testing of HIV 1 and 2 antibodies after completion of 12 weeks.This will be confirmatory as 12 weeks is the maximum limit of production of antibodies.
Don't worry at all.You are almost safe.
Get well soon.
Hope I have answered your query.
Further queries are most welcome.
Take Care
Dr.Indu XXXXXXX


Yes,you should go for tests for 100 % confirmation.
Detailed Answer:
Hello
Sorry for replying late
Yes,you should go for these tests for 100 % confirmation.
Get well soon.
Hope I have answered your query.
Further queries are most welcome.
Take Care
Dr.Indu XXXXXXX

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