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Acute hemolytic transfusion reaction caused by anti-Coa
R B Covin1, K S Evans, R Olshock
1University of Colorado Health Sciences Center, Department of Pathology, Denver, Colorado 80262, USA.
Immunohematology
|September 18, 2004
Summary
This study reports the first known case of an acute hemolytic transfusion reaction (AHTR) caused by the high-frequency Coa blood group antibody. This finding expands the known clinical significance of Coa alloantibodies in transfusion medicine.
Area of Science:
- Transfusion Medicine
- Immunology
- Hematology
Background:
- Coa antigen, part of the Colton blood group system, is present on 99.8% of red blood cells (RBCs).
- Anti-Coa antibodies are known to cause delayed hemolytic transfusion reactions and hemolytic disease of the newborn.
- Acute hemolytic transfusion reactions (AHTRs) due to anti-Coa have not been previously documented.
Purpose of the Study:
- To report the first case of an AHTR caused by anti-Coa.
- To highlight the potential for severe transfusion reactions with high-frequency antigens.
Main Methods:
- Patient's blood samples were analyzed using standard blood bank techniques, including alloabsorption studies.
- Clinical presentation and laboratory findings were correlated to determine the cause of the transfusion reaction.
- Pre- and post-transfusion samples were reevaluated to confirm antibody identification.
Main Results:
- A patient developed an AHTR following transfusion with least-incompatible RBCs.
- Laboratory reevaluation identified anti-Coa in both pre- and post-transfusion samples.
- The patient experienced fever, hemoglobinuria, and a drop in hematocrit, consistent with an AHTR.
Conclusions:
- This case represents the first documented instance of an AHTR caused by anti-Coa.
- The findings underscore the importance of considering antibodies to high-frequency antigens in transfusion reactions.
- Further investigation into the clinical significance of anti-Coa is warranted.