Table 6: Testing Serum with Known Reagent Red Cells

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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 6: Testing Serum with Known Reagent Red Cells

Patient Serum Tested with Known Reagent Red CellsAntibodies Present in Serum
A1 CellsB Cells
0
3–4+
Anti-B
3–4+
0
Anti-A
3–4+
3–4+
Anti-A and Anti-B
0
0
No ABO antibodies present
+ = agglutination (graded 1+ to 4+); 0 = no agglutination or hemolysis