Purpose A2 and A2B are rare phenotypes of the ABO blood group system. Some individuals
with A2 and A2B may have anti-A1 antibodies that may be clinically significant or
insignificant. The aim of this study was to determine the frequency of A2, A2B phenotypes
and anti-A1 antibodies in blood donors in Jazan, Saudi Arabia. This study also evaluated
the reactivity potential of anti-A1 antibodies. Materials and Methods Blood samples collected
from 446 blood donors were typed for ABO (cell and serum grouping) and Rh D. Individuals …

Abstract Context: A2 and A2B are rare phenotypes of ABO blood group system. The
presence of anti-A1 in A2 and A2B subgroups may cause hemolytic transfusion reaction if
active at 370c. Aim: To assess the prevalence of A2 and A2B subgroups along with anti-A1
in blood donors of Bangladesh. Setting and design: Cross sectional study in a tertiary care
hospital, Bangladesh. Subjects and Methods: The study included blood donor samples
received at Transfusion Medicine Department. All samples were typed for ABO and RhD …