Transfusion Datum is a four-letter term used to describe the process of transferring blood from one person to another. It is a medical procedure that is often used to treat anemia, trauma, and other medical conditions. Transfusion Datum is also used to replace lost blood during surgery or childbirth. The process involves taking blood from a donor and transfusing it into the recipient's body. The donor's blood is tested for compatibility with the recipient's before the transfusion takes place. The process is closely monitored to ensure the safety of both the donor and recipient.