Testing Patient Serum With Known Reagent Red Cells (Reverse Grouping) from Introduction to the ABO Blood Group System, presented by MediaLab

ABO Typing

Testing Patient Serum With Known Reagent Red Cells (Reverse Grouping)

Patient Serum Tested With Known Reagent Red Cells		Antibodies Present in Serum
A₁ Cells	B Cells	Antibodies Present in Serum
0	4+	Anti-B
4+	0	Anti-A
4+	4+	Anti-A and Anti-B
0	0	No ABO antibodies present

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

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