Red blood cell phenotype matching for various ethnic groups

Area of Science:

• Transfusion Medicine
• Immunology
• Genetics

Background:

• Chronic transfusion support is vital for many patients.
• Red blood cell (RBC) transfusions carry a risk of alloimmunization due to antigen disparities.
• Current matching protocols may not adequately address extended antigen profiles.

Purpose of the Study:

• To investigate the probability of achieving exact extended phenotype matches between blood donors and patients from specific ethnic groups.
• To assess the risk of alloimmunization based on donor-recipient antigen profile compatibility.

Main Methods:

• Molecular testing of 1,000 blood donors for Rh, Kell, Kidd, Duffy, and MNS antigens.
• Evaluation of phenotype distribution and calculation of match probabilities using a subsample of 800 donors.
• Comparison of donor phenotypes against randomly selected patients from various ethnic groups.

Main Results:

• High probability (>80%) of exact K/k allele matches in the Kell system.
• Low probability (3-38%) of exact matches for Rh, Kidd, Duffy, and MNS systems, varying by ethnicity.
• Significant donor-recipient phenotype mismatch identified for specific blood group antigens.

Conclusions:

• Routine ABO and D matching is insufficient for preventing alloimmunization in certain ethnic groups.
• A significant risk of alloimmunization exists for patients requiring chronic transfusion support due to ethnic disparities in blood group antigen profiles.
• Extended phenotype matching strategies are needed to mitigate transfusion risks.