B subgroup detection in a small hospital transfusion service

Area of Science:

• Hematology
• Immunology
• Genetics

Background:

• The ABO blood group system is defined by A and B antigens on red blood cells (RBCs) and substances in secretions.
• Phenotypes vary in antigen quantity, leading to subgroups, with B subgroups being exceptionally rare.

Observation:

• A case report details a B subgroup identified in a young, healthy, pregnant woman via adsorption-elution methods at a transfusion service.
• Discrepancies between RBC and serum grouping results typically indicate potential B subgroups.

Findings:

• Serology confirmed a B subgroup, though standard ABO gene sequencing revealed no identifiable genetic changes.
• Molecular and adsorption-elution methods are crucial for identifying rare B subgroups.

Implications:

• Accurate identification of B subgroups in donors and recipients is vital for resolving ABO discrepancies.
• Preventing ABO incompatibility through correct blood typing minimizes transfusion reactions and ensures patient safety.