Main Subgroups of A
•When red cells express differing number of red cell antigens and may have qualitative differences as well.
•What is a subgroup:
•What are the main subgroups of A:
•A1
•A2
•What are the differences in the main subgroups of A:
•Quantitative differences:
•Qualitative differences
•A1 have 2 million A antigens/RBC
•A2 have 1/2 million A antigens/RBC
•A1 positive with anti-A and anti-A1 lectins
•A2 positive with anti-A but negative with anti-A1 lectins