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Updated: Jun 19, 2026

Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

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Published on: January 29, 2014

Overt immediate hemolytic transfusion reaction attributable to anti-Wr(a).

¹Geisinger Medical Center, Danville, PA 17822, USA.

Immunohematology

|October 23, 2009

Summary

Anti-Wr(a) antibodies can cause transfusion reactions. A patient experienced an acute hemolytic transfusion reaction after receiving Wr(a+) red blood cells, highlighting the clinical significance of this antibody.

Area of Science:

Immunology
Transfusion Medicine
Hematology

Background:

The Wr(a) antigen is a low-prevalence red blood cell (RBC) antigen.
Anti-Wr(a) antibodies are found in about 1% of healthy blood donors.
These antibodies have been associated with varying degrees of hemolysis in transfusion reactions and hemolytic disease of the newborn (HDN).

Observation:

This case report details an acute overt hemolytic transfusion reaction.
The patient had pre-existing anti-Wr(a) antibodies in their serum.
The reaction occurred after transfusion with a Wr(a+) RBC component.

Findings:

The presence of anti-Wr(a) antibodies in a recipient led to a clinically significant hemolytic transfusion reaction.
The transfusion of Wr(a+) RBCs to a patient with anti-Wr(a) antibodies resulted in an acute overt hemolytic event.

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Implications:

Clinicians should consider screening for anti-Wr(a) antibodies in patients with unexplained hemolytic reactions.
Careful donor-recipient matching for the Wr(a) antigen is crucial for patients with anti-Wr(a) antibodies to prevent transfusion reactions.
This case underscores the importance of recognizing and managing antibodies to low-prevalence antigens in transfusion medicine.