Blood tests are not available to check for AIDS. If you want to test for HIV, you can do so by drawing blood, but the blood test must be for HIV-related items, which may be antibodies to HIV. After HIV infection, the immune system can produce antibodies against HIV, and these antibodies can be used to determine whether or not the body is infected with HIV, and the antibodies produced by HIV do not have a protective effect, but are only a reminder. In addition, we can also check the nucleic acid of HIV, that is, its RNA. If we only check the blood, we will not include the above items, but only check the number and size of the cells that can be seen in the blood circulation, such as red blood cells, white blood cells and platelets, among which we can also check the classification of white blood cells. However, it is not possible to check for further subdivision of cells, or the composition of antibodies other than cells.