AIDS examination is not a routine examination item for hospitalization, without special circumstances, hospitalization will not necessarily check AIDS, because AIDS does not need isolation treatment, AIDS does not spread through respiratory and close contact, but if the process of treatment requires the application of blood products or blood transfusion, AIDS will be checked. In addition to AIDS, hepatitis B, hepatitis C and syphilis will also be checked. The above four diseases can be transmitted through the blood route, so in order for the hospital and the patient to each be protected, so the examination needs to be carried out and filed first, with the purpose that after bleeding in case it causes infection, both parties can reverse the proof and exercise their legal rights. The common feature of AIDS, syphilis, hepatitis B and hepatitis C is that they can be transmitted through the blood route, they can be transmitted through sexual contact, and they can be transmitted vertically from mother to child.