Passing a blood donation means that the donor’s blood meets the requirements for blood donation. After passing a blood donation, the following diseases can be ruled out: i. Most blood system diseases, such as various anemic diseases, as well as leukocytosis and thrombocytopenia diseases. Because these diseases can be detected through routine blood tests, a qualified blood donor can exclude these blood system diseases. Second, it can exclude various infectious diseases, especially those transmitted through blood, such as AIDS, hepatitis C, syphilis and positive hepatitis B surface antigen. Because these are among the items that must be checked before a patient donates blood, all of these viruses can be transmitted to healthy people through blood, so they are usually subjected to strict laboratory tests when donating blood. If the donor’s blood passes the test, the donor is not carrying these viruses in his or her body.