Multiple Irregular Antibodies in Alloimmunized Patients: immunohematologic techniques for their detection and typing
DOI:
https://doi.org/10.56294/saludcyt20262655Keywords:
Alloimmunization, Irregular erythrocyte antibodies, Blood group antigens, Coombs test, Column agglutination, Solid-phase adherenceAbstract
Introduction: alloimmunization is a frequent complication in chronically transfused patients, resulting from repeated exposure to erythrocyte antigens that differ from the recipient’s own. This immune response leads to the development of irregular alloantibodies that compromise transfusion compatibility and increase the risk of hemolytic reactions, particularly when multiple alloantibodies coexist.
Methods: a systematic review was performed following the PRISMA guidelines, based on a search of regional and international scientific databases. Studies published between 2020 and 2025 that addressed alloimmunization, the presence of multiple irregular erythrocyte alloantibodies, and the immunohematologic techniques used for their detection were included.
Results: the most frequently identified alloantibodies primarily belonged to the Rh and Kell blood group systems, with recurrent simultaneous combinations among them. For their detection, the manual tube test, column agglutination (CAT), and solid-phase red cell adherence (SPRCA) techniques were evaluated. SPRCA demonstrated higher sensitivity for detecting weak or coexisting alloantibodies, whereas CAT provided standardized interpretation and broad clinical applicability.
Conclusions: the detection of multiple irregular alloantibodies requires a strategic combination of immunohematologic methodologies. Although SPRCA offers superior analytical sensitivity in complex samples, CAT remains a reliable and widely accessible alternative in routine clinical laboratory practice, supporting safer transfusion decision-making.
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