Subgroups of A
Reaction of Red Cell Subgroups With Known Antisera
Subgroup
Patient Red Cells Tested with Known Antisera
Anti-A1 in Serum?
Anti-A
Anti-A1
Anti-A,B
A1
4+
No
A2
0
Yes, 1-2%
A3
2+, mixed field
Yes, but % not available
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