If a general person wants to test for HIV and syphilis, there is a quick and easy method, which is to do a blood test called the "pre-transfusion four tests." This specifically includes four components: HIV antibodies, syphilis antibodies, hepatitis B, and hepatitis C. Therefore, by going to the hospital for a blood draw and taking the pre-transfusion four tests, you can early screen for both HIV and syphilis. However, if it is the early stage of infection with these diseases, also known as the window period, it may result in a false negative. You mentioned that you might have HIV or syphilis, but the result could temporarily be negative. Therefore, to be certain, it is recommended to retest after 3-6 months.