FREQUENCIES OF ABO AND Rh-D BLOOD GROUPS AMONG STUDENTS OF LEMEN SECONDARY AND PREPARATORY SCHOOL, SOUTH-WEST SHAWA, OROMIA, ETHIOPIA

Frequencies of ABO and Rhesus (Rh-D) blood groups phenotypes, alleles, and genotypes vary geographically, ethnically and from one population to another. Some variations may even occur within one ethnic group and within one small country. Therefore, the aim of this study was to determine the frequencies of ABO and Rh-D Blood Groups phenotypes, alleles and genotypes among students of Lemen Secondary and Preparatory School, South-West Shawa, Zone, Oromia, Ethiopia. A total of 384 students (male=276 and female=108) voluntarily participated in this study. Each student was typed for ABO and Rh-D blood groups antigens using agglutination reactions. In the sample, the O, A, B, and AB blood group systems phenotype percentages were 39.6%, 32.3%, 22.92% and 5.2%, respectively. The Rhesus positive incidence was 95.8%, while Rhesus negative was 4.2%.The genotypic frequencies of ABO blood group of the sample was 0.0443(4.43%) IAIA, 0.267(26.71%) IAIO, 0.0234(2.34%) IBIB, 0.1942(19.42%) IBIO, 0.064(6.4%) IAIB and 0.4031(40.31%) IOIO and genotypic frequencies for Rh-D blood group systems are 0.6336(63.36%) for DD, 0.3246(32.46%) for Dd and 0.0415(4.15%) for dd. The order of ABO blood group allele frequencies were IO> IA> IB in the samples. The allele frequencies of IO, IA, and IB in the sample were found to be 0.6349, 0.2104, and 0.1529 respectively. The Rhesus blood group allele frequencies of the sample were 0.7961D and 0.2039 d. The result of the present study implies that blood type O is the most frequently occurred blood type in the study area.