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The Rhesus (Rh) system is the second most important blood group system after ABO, has the highest immunogenicity and tends to produce alloantibodies that cause most transfusion reactions. In the Rh blood group system, there are more than 55 antigens, but the main ones are D, C, E, c, and e. Currently, only the D antigen is carried out without examining four other important Rh antigens. Still scarce, studies on the proportion of Rh antigens, except D, in Indonesia; in this study we have determined Rh antigens and phenotypes among a population of routine blood donors. The purpose of this study was to determine the phenotypic variation and frequency distribution of the main antigens of the Rhesus blood group system in routine blood type O blood donors at UDD PMI Depok City. This study was descriptive and observational with a cross-sectional design. Primary data are obtained from the Rhesus system antigen examination results on donor blood samples. The sample was 140 blood samples from 140 routine donors. A rhesus phenotyping examination was carried out using the gel method. The study was conducted on 140 routine donor blood samples at UDD PMI Depok City. The characteristics of the subjects were male (69.29%) and female (30.71%), with an average age of 38 years. Samples are analyzed for five major Rhesus antigens. Rhesus antigen test shows D antigen (100%), e antigen (97.14%), C antigen (95.71%), c antigen (36.43%) and E antigen (27.86%). Rhesus phenotype results were R1R1 (DCe/Dce) (62.86%), R1R2 (DCe/DcE) (22.86%), R1r (DCe/dce) (9.29%), R2R2 (DcE/DcE) (2.86%), R2r (DcE/dce) (1.43%), and R1RZ (DCe/DCE) (0.71%). In conclusion, the frequency of phenotypic changes in the Rh blood group system of regular blood donors at UDD PMI Depok City is classified as the most common types: DCe/DCe, DCe/DcE, DCe/dce, DcE/DcE, DcE/dce and DCe/DCE.
Gantini et al. (Mon,) studied this question.