The most important diagnostic basis for confirming a diagnosis of AIDS is a positive HIV antigen, HIV antibody or HIV nucleic acid test.
HIV antigen testing is usually done 2 weeks after high-risk exposure. HIV antibodies are usually detected within 6 weeks, while HIV nucleic acid DNA or RNA can be detected within 6 days. HIV infection can be clearly diagnosed if any of these three tests are positive. After the diagnosis of HIV, it is necessary to check lymphocytes CD4 etc. to determine the stage of development of HIV.
So, if you want to know if you are infected with HIV, you must go to a testing facility to have your antibodies tested. When the report is reviewed, the blood is sent to the CDC for a confirmatory test.