STUDY OF WEAK D PHENOTYPE IN HETEROGENEOUS POPULATION

Area of Science:

• Immunology
• Hematology
• Genetics

Background:

• Weak D refers to reduced expression of the Rhesus (Rh) D antigen on red blood cells.
• This variation arises from quantitative or qualitative differences in the Rh antigen.
• Accurate identification of Rh D status is crucial for transfusion medicine and pregnancy management.

Purpose of the Study:

• To determine the prevalence of weak D phenotypes in a specific patient cohort.
• To analyze the distribution of weak D phenotypes across different ABO blood groups.
• To assess the clinical implications, if any, of detected weak D cases.

Main Methods:

• Retrospective analysis of Rh D confirmation tests performed between January 1986 and August 1997.
• Identification and documentation of all weak D phenotypes.
• Categorization of weak D phenotypes by ABO blood group and patient sex.

Main Results:

• A total of 5042 Rh D confirmation tests were reviewed.
• 22 cases (0.43%) of weak D phenotypes were identified.
• The majority of weak D phenotypes were observed in individuals with blood group O (68.3%), followed by blood group A (22.7%).
• Cases were also noted in blood groups B and AB (4.5% each).
• The study included 15 males and 7 females with weak D phenotypes.
• No instances of hemolytic disease of the newborn or Rh incompatibility were reported in the identified weak D cases.

Conclusions:

• The prevalence of weak D phenotypes in this study population was 0.43%.
• Blood group O appears to be more frequently associated with weak D phenotypes.
• The absence of hemolytic disease of the newborn or Rh incompatibility suggests a potentially lower clinical risk in this cohort, warranting further investigation.