Table 1.

Anti-A characteristics of 30 group O blood donors

ObservationTiter <100Titer >100
IgM titer* 30 0 
IgG titer† 4 26 
Complement C3b activation‡ 2 8 
ObservationTiter <100Titer >100
IgM titer* 30 0 
IgG titer† 4 26 
Complement C3b activation‡ 2 8 
*

IgM titer evaluated by direct hemagglutination using ID-Microtyping System buffered cards.

†

IgG titer evaluated using ID-Microtyping System anti-IgG cards.

‡

RBC-bound complement C3b evaluated with anti-C3b/d after anti-A sensitization followed by washing and incubation with AB serum.

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