The five items checked before donating blood in the blood donation van are: a. Routine blood test. Through the routine blood test, we can generally determine whether there are blood system diseases, and we can also determine whether the donor is anemic or not, if there are blood system diseases or anemia, we cannot donate blood. Hepatitis B five-item test, through the hepatitis B five-item test, you can know whether the patient is a major triple-positive, minor triple-positive or carrier, if the patient is a carrier or a major triple-positive or minor triple-positive, you cannot donate blood. Hepatitis C antibody test: Hepatitis C antibody can be transmitted to other people through blood, so people with positive hepatitis C antibody cannot donate blood. Four, syphilis antibody, syphilis antibody positive people, can be transmitted to other people through blood donation syphilis spirochete, is not to donate blood. V. AIDS antibodies, patients with positive AIDS antibodies can transmit the AIDS virus to others through blood, and are also not allowed to donate blood.