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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+

4+

4+

No

A2

4+

0

4+

Possible (Yes, about 4%)

A3

2+, mixed field

0

2+, mixed field

Possible (exact percentage unknown)



+ = agglutination (graded 1+ to 4+)
0 = no agglutination