Reaction of Red Cell Subgroups With Known Antisera

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The page below is a sample from the LabCE course Introduction to the ABO Blood Group System. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Reaction of Red Cell Subgroups With Known Antisera

Table 4. 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