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How does donor plasma compatibility differ from donor red cell compatibility?
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blood group
The major component of human blood is the red blood cell.
Donor compatibility for red cells and plasma differs because they contain opposite components of the ABO blood group system. Compatibility is determined by the presence or absence of specific antigens on red cells and corresponding antibodies in the plasma.1
- Red Cell Compatibility: Red cells carry A or B antigens. If a recipient has antibodies against these antigens, a fatal hemolytic transfusion reaction can occur. Therefore, donors must be chosen so their red cell antigens do not conflict with the recipient's serum antibodies. For example, type O individuals are universal red cell donors because their cells lack A and B antigens.12
- Plasma Compatibility: Plasma contains antibodies against A or B antigens. Consequently, plasma compatibility is the inverse of red cell compatibility. A donor's plasma must not contain antibodies that would attack the recipient's red cells. For instance, type AB individuals are universal plasma donors because their plasma lacks both anti-A and anti-B antibodies.1
In clinical practice, blood grouping and cross-matching are essential to ensure these components are safely matched for every patient.12