Antibody type in Blood Group O

[sahell]

Are the antiA/B antibodies IgM or IgG? FA says M and UW says G. Anyone know for sure?

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[Ismet]

Mostly IgG. That's how they cross the placenta and can cause hemolytic disease of the newborn.

Anti-A and Anti-B antibodies in blood groups B and A, respectively, tend to be more IgM.

The ABO blood group - Blood Groups and Red Cell Antigens - NCBI Bookshelf