What are Blood Transfusions?
Blood transfusion is the process of transferring blood or blood-based products from one person into the circulatory system of another. Blood transfusions can be life-saving in some situations, such as massive blood loss due to trauma, or can be used to replace blood lost during surgery. Blood transfusions may also be used to treat a severe anaemia or thrombocytopenia caused by a blood disease. People suffering from hemophilia or sickle-cell disease may require frequent blood transfusions.
Basically a Blood Transfusion is the last resort to major trauma where a lot of blood is lost and it cannot be replaced by the body alone, so then the doctors replenish your supply of blood with donated blood to help you get back to a normal level. The quoted above is from source 1. Good Luck!
Source(s):
1. http://en.wikipedia.org/wiki/blood_trans...
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