Warm autoantibodies mimicking alloantibodies: Three cases of autoantibodies with unusual antigenic specificity.
Am J Clin Pathol
; 160(6): 561-565, 2023 Dec 01.
Article
em En
| MEDLINE
| ID: mdl-37598315
ABSTRACT
OBJECTIVES:
We describe 3 cases of red blood cell (RBC) autoantibodies with unusual apparent antigenic specificity and discuss the testing methodology and implications of these findings.METHODS:
All immunohematologic testing, including ABO and RhD typing, antibody detection and identification, RBC antigen phenotyping and genotyping, direct antiglobulin tests, and elution studies were performed using standardized and validated methods and reagents.RESULTS:
Three patients were found to have autoantibodies, which were originally presumed to be alloantibodies. Case 1 was a 60-year-old man with autoanti-Jka following babesiosis; case 2 was a 79-year-old woman with an autoanti-f; and case 3 was a 28-year-old pregnant woman with an autoanti-S. Cases 1 and 2 required RBC transfusions, which were performed with Jka-negative and f-positive RBC units, respectively. No transfusion reactions were reported, and the hemoglobin responded appropriately in both cases.CONCLUSIONS:
These 3 cases complement the minimal literature regarding warm autoantibodies with unusual antigenic specificity and their potential to mediate clinically significant hemolysis. There are only rare reports of warm autoantibodies with specificity for non-Rh antigens, and prior authors have suggested that autoantibodies with mimicking specificity are usually detected only serologically; in contrast, 2 of the 3 patients herein experienced autoimmune hemolytic anemia.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Autoanticorpos
/
Anemia Hemolítica Autoimune
Tipo de estudo:
Prognostic_studies
Limite:
Adult
/
Aged
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Female
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Humans
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Male
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Middle aged
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Pregnancy
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article