We found 51 cases (0.04%) of ABO discrepancies out of
104,010 donors. Frequency wise cause of ABO discrepancy
found at our centre after excluding technical errors
were – weak/low avidity anti B antibodies (58.8%), weak
A or subgroup of A antigen (19.6%), alloantibodies (9.8%),
not resolved (5.8%), weak B or subgroup of B antigen
(3.9%) and Bombay blood group (1.9%) (Table 1). To best
of our knowledge, this is the first study proving the data
on frequency wise occurrence of ABO discrepancies