Weaker Variants of �A� and �B� in India

Incidence of ‘Bombay’ (Oh) Phenotype and Weaker Variants of A and B Antigen in Bombay (India)

“…Bhatia and Sanghvi [2] had earlier reported a rough estimate of this rare blood group as 1:13,000 in Bombay population. Weak A and B variants have also been reported from Bombay [3,12,16] and have been regularly encountered by our laboratory from the samples referred from different blood banks for their problems in cell and serum grouping. This paper attempts to give an estimate of the incidence of these rare blood groups in populations sampled at two major blood banks in Bombay, where the methods of grouping and cross-matching have been identical, and all samples giving conflicting cell and serum grouping were investigated by our laboratory.…”