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
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.
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.