Nov 30, 2002
Is there a window period for the western blot? A friend had an indeterminate elisa and western blot came back neg. I have no idea about the time of their exposure. Are there false neg western blots?
Response from Mr. Kull
Indeterminate ELISAs with a negative Western Blot means that you are HIV negative. Any ELISA/EIA tests that are indeterminate or positive that are followed up by an negative Western Blot signify that the person is HIV antibody negative. The Western Blot is highly specific and is not likely to be falsely negative.
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