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Why is type O blood not a universal blood type?

Mar 28, 2023 Source: Cainiu Health
Dr. Zhang Heyang
Introduction
Type O blood is not a universal blood type, as current transfusion principles emphasize transfusing the same blood type whenever possible. Hemolysis generally does not occur under this practice. Moreover, when a person with type O blood donates to a recipient with type A or type B blood, it is still necessary to consider whether the recipient's red blood cells might react with antibodies in the donor's serum. Therefore, type O blood is not universally compatible.

O-type blood is not universal blood, as current transfusion principles primarily emphasize transfusing the same blood type.

In emergency situations when no other options are available, and in order to save a patient's life, small amounts of O-type blood may be administered under medical supervision. However, O-type blood is not truly universal; rather, individuals with O-type blood are considered universal donors, meaning they can donate blood to people of any blood type.

Generally, the principle of blood transfusion is to match the same blood type: for example, A-type blood should only be given to patients with A-type blood, and B-type blood only to those with B-type blood. Transfusing different blood types may lead to hemolytic reactions. Since O-type red blood cells lack both A and B antigens, in emergencies and under medical guidance, O-type blood can be given to patients with A, B, or AB blood types without usually causing hemolysis.

Nevertheless, when an individual with O-type blood donates to a recipient with A or B blood type, it is still necessary to consider whether the recipient’s red blood cells might react with antibodies present in the donor’s serum. Therefore, O-type blood is not universally compatible or completely safe in all circumstances.


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