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how accurate can a western blot test be?
i recently took a western blot test after 4 weeks of my unproctected sexual encounter it came out negative but i have been reading that after 4 weeks the western blot might not be accurate. is this true? i would really appreciate the response of an expert in the subject. thanks
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You only needed a western blot if you took an ELISA and it was positive. If you didn't then you were given the wrong test.

For a conclusive result, all you need is an antibody test 3 months after exposure. You should not have a western blot unless that antibody test is positive.
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so this means the results might be wrong?
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Yes, it means that 4 weeks is too early for HIV testing for people who have had a risk.

This forum recommends a first antibody test at 6 weeks. If that test is negative, it is considered a good indication of your status and highly unlikely to change. However, a conclusive result can only be obtained 3 months after exposure.
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o.k thanks but at this point i don't have any of the symptoms i've reading that could mean you have been infected is this a good sign?
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Symptoms or lack thereof are never a good indicator; many people who seroconvert do not experience ANY symptoms.
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