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pcr test detect the virus after 28 days or 10 days?

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you replied this answer to me regarding pcr dna test.
"A proviral DNA PCR - at 3-4 weeks post exposure - can be confirmatory. (Although the earliest results can be available within 7-10 days of exposure)".
i cant understand this sentence" (Although the earliest results can be available within 7-10 days of exposure)"
actually when the pcr test detect the virus after 28days or 10 days.
plz answer me iam in the big problem.I want to clear my doubts.

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replied April 28th, 2011
HIV and AIDS Answer A22465
Hello and welcome to e health forum.

The answer provided earlier is self explanatory. Some variants of the tests give results within 10 days, and some within 3 weeks. Hence for practical reasons, and to avoid ambiguity, and the need for retesting, it is advised to get tested at 3-4 weeks post exposure.

In case, you do a test within 2 weeks and detect the virus, then treatment can be started ASAP.

But presence of a negative, test, may cause alarm and then you will get anxious about the validity of the test, and you will think about retesting.

This is a very common knee jerk reaction in all individuals who think they have been exposed to HIV.

So the best thing, to do is either do a single PCR proviral DNA test after 28 days, and if this is negative, no need to repeat any tests again.

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