Difficulties in immunohaematology: The weak D antigen

Difficulties in immunohaematology: The weak D antigen

Background: The Rh blood system is one of the most polymorphic and immunogenic systems known to humans. The expression of Rh blood group antigen is complex. The Rh D antigen is the most important of the antigens that constitute the Rh antigen system. In most cases, D antigen can easily be detected....

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Veröffentlicht in:Medical journal. Armed Forces India 2005-10, Vol.61 (4), p.348-350
Hauptverfasser: Kumar, H, Mishra, DK, Sarkar, RS, Jaiprakash, M
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Rh Blood Group
Weak D
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container_title Medical journal. Armed Forces India
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creator Kumar, H
Mishra, DK
Sarkar, RS
Jaiprakash, M
description Background: The Rh blood system is one of the most polymorphic and immunogenic systems known to humans. The expression of Rh blood group antigen is complex. The Rh D antigen is the most important of the antigens that constitute the Rh antigen system. In most cases, D antigen can easily be detected. However, due to variability of expression, weak forms antigen are encountered. The reactivity of weak D with antisera is variable and presents as a problem in blood banking. Methods: A retrospective analysis for a five-year period was done. Blood samples that were negative for Rh D by immediate spin tube method were tested for weak D antigen by additional lab tests. Result: Of 34932 serial Rh grouping tests done in our Blood Bank, the incidence of weak D Rh antigen was 0.189%. All these were confirmed by the antiglobulin test. Conclusion: These patients present as a problem for the blood banker and a curiosity to the clinician. Although uncommon, all health care workers should be aware of this entity to avoid anti D alloimmunisation.
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Rh Blood Group
Weak D
title Difficulties in immunohaematology: The weak D antigen
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