- published: 16 Feb 2015
- views: 17450
Blood transfusion is the process of receiving blood products into one's circulation intravenously. Transfusions are used in a variety of medical conditions to replace lost components of the blood. Early transfusions used whole blood, but modern medical practice commonly uses only components of the blood, such as red blood cells, white blood cells, plasma, clotting factors, and platelets.
They are typically only recommended when a person's hemoglobin levels fall below 70-80 mg/dL. One may consider transfusion for people with symptoms of cardiovascular disease such as chest pain or shortness of breath. Globally around 85 million units of red blood cells are transfused in a given year.
Before a blood transfusion is given, there are many steps taken to ensure quality of the blood products, compatibility, and safety to the recipient.
Blood transfusions typically use two sources of blood: one's own (autologous transfusion), or someone else's (allogeneic transfusion). The latter is much more common than the former. Using another's blood must first start with donation of blood. Blood is most commonly donated as whole blood intravenously and collecting it with an anticoagulant. In developed countries, donations are usually anonymous to the recipient, but products in a blood bank are always individually traceable through the whole cycle of donation, testing, separation into components, storage, and administration to the recipient. This enables management and investigation of any suspected transfusion related disease transmission or transfusion reaction. In developing countries the donor is sometimes specifically recruited by or for the recipient, typically a family member, and the donation occurs immediately before the transfusion.
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