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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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Testing the Red Cells With Known Antisera

Patient Red Cells Tested With Known Antisera

ABO Antigens Present on Red Cell

Anti-A

Anti-B

Anti-A,B

3-4+

0

3-4+

A

0

3-4+

3-4+

B

0

0

0

Neither A nor B

3-4+

3-4+

3-4+

A and B

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