From a testing point of view ANY HIV test perfomed around the 11 week mark will give you an accurate result, either way. As has been stated many times on the HIV forums and by Dr HHH. See the Dr's advice on "time to positive HIV test". That should reassure you.
Okay, the Ag/Ab test you had is designed to indentify early HIV infection. The P24 Antigen is a protein that is produced in the blood stream before antibodies are produced.
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