Table 2. Forward and reverse grouping with different blood groups.

(+) = Agglutination, (-) = No reaction

Blood group	Anti-A antibodies	Anti-B antibodies	Anti-A,B antibodies	A1 cells	B cells	O cells
A	+	-	+	-	+	-
B	-	+	+	+	-	-
AB	+	+	+	-	-	-
O	-	-	-	+	+	-
Bombay phenotype	-	-	-	+	+	+