In general terms, a blood transfusion is a therapeutic process which aims to correct haematological deficiencies. However, it can provoke side effects in some cases: so-called transfusion reactions or adverse reactions, which describe any contrary effect or unexpected reaction caused by a blood product transfusion.
The entire process carried out by the blood banks is aimed at avoiding transfusion reactions. However, they do still happen. The reason is that in vitro tests are a poor reflection of what happens in vivo and things can happen during the transportation, storage and administering of blood which compromise the safety of the recipient.
It should be said that there is a range of transfusion reactions and their possible consequences are very wide, ranging from feeling slightly unwell to death.
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