Forward typing |
No reactivity with anti-A or anti-B |
No or weak reactivity with anti-A and/or anti-B |
Reverse typing |
Strong reactivity with group O, group A, and group B RBCs |
Weak reactivity with group O, group A, and/or group B RBCs |
Reactivity with anti-H lectin |
No reactivity |
Weak reactivity |
Reactivity with group O icord RBCs |
Strong reactivity |
No reactivity |
Saliva secretor status |
Nonsecretor of H, A, and B substances |
Usually secretor of H, A, and/or B substances |
Leb phenotype (indication for secretor status) |
Le(b–) |
Le(b–) or Le(b+) |
Antibody testing with panel RBCs |
Panreactivity: equal strength |
Panreactivity: differential strength |
Adsorption elution studies for H, A, and/or B antigens |
Negative |
May be negative or weakly positive |