I have a general query. I would like to know say a person has HIV and if he does not know about it. He then acquires AIDS. So, even after having AIDS, will there be HIV antibodies in his blood? If he goes for an HIV antibody test after acquiring AIDS, will the antibody test result will be positive? Or will there be antibodies at later stages? My second question is does any medical condition or disease or medication in the past or present have any effect on the HIV test and HIV window period? If a person's test is negative after, say, three months from the antibody test then can he consider the report conclusive and not worry about the interference from any disease or medications? Kindly provide a descriptive answer and explanation.