What is Weak D?

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Rhesus (Rh) blood group with variable expression of D antigen is one of the complex systems in immunohematology. Weak D antigen is a phenotype where the D antigen is weakly expressed on red blood cells, and this antigen cannot be detected by routine methods.

In blood donation, weak D and partial D individuals can only receive blood from D negative individuals and can only donate to D positive individuals.

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