Table 4: 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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Table 4: Reaction of Red Cell Subgroups with Known Antisera

SubgroupPatient Red Cells Tested with Known AntiseraAnti-A1 in Serum?
Anti-AAnti-A1Anti-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