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The page below is a sample from the LabCE course Introduction to the ABO Blood Group System. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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The Bombay Blood Group

Homozygous "hh" individuals do not form H substance and thus have no way for late sugars to attach. The blood group resulting from the homozygous "hh" condition is called the Bombay blood group (Bombay phenotype). Due to the presence of anti-H in the serum of a person with the Bombay phenotype, only blood from another person with the Bombay phenotype may be transfused.