What is the window period for HIV Western blot test?

Question

Hello doctor,

What is the window period for the HIV (Human Immunodeficiency Virus) western blot test from the date of a suspected exposure? And, what is the accuracy of the test?

Kindly guide.

Answer 1

Hello,

Welcome to icliniq.com.

Western blot is a confirmatory test for HIV (human immunodeficiency virus), not a primary one. It is highly sensitive and specific. It comes positive in six to eight weeks of exposure.

I hope this helps.

Thank you.

Answer 2

Hello,

Welcome back to icliniq.com.

Get a fourth-generation ELISA (enzyme-linked immunosorbent assay) test done for HIV 1 and HIV-2, as it has been six weeks after the exposure. Repeat it after three months of exposure, pertaining to the fact that you have no exposure in between. If both are negative, you need not worry. Do send us the reports for evaluation.

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Thank you.

Answer 3

Hello,

Welcome back to icliniq.com.

Even small laboratories maintain basic standards these days. So, do not worry too much. ELISA is done at six weeks and three months after exposure because a very small number of patients do not develop antibodies by six weeks. The fourth generation tests detect both antigen and antibodies. The repeat test in the third month is just to be sure. RNA PCR (polymerase chain reaction) is a test that is the first to be positive within days of the exposure.

I hope this helps.

Please feel free to reach out in case of further queries.

Thank you.