Objective: To determine the distribution pattern of ABO and Rhesus blood groups among different ethnic populations in an urban centre.
Methods: The retrospective cross-sectional study was conducted at Kharadar General Hospital, Karachi, from May to Dec 2017, and comprised antenatal and walk-in individuals of different ethnic groups who were tested at the hospital's clinical laboratory. Blood groups typing was carried out using Slide Agglutination (antigen-antibody) method with antisera anti-A, anti-B, and anti-D. SPSS 16 was used for data analysis.
Results: Of the 3521 subjects, 1253(35.6%) had blood group O, 1167(33.1%) group B, 849(24.1%) group A and 252(7.2%) had group AB. Also, 3209(91.1%) were Rhesus-positive and 312(8.9%) Rhesus-negative. Blood group Opositive was predominant in Balochi 381(41%), Mohajir 197(36%), Sindhi 147(38%), Hindko 39(44%) and Seraiki14(43.8%) groups, while B-positive was common among Pathan 207(35%), Punjabi 116(35%), Kacchi 123(37%), Memon 79(37%) and Bengali 20(36%) groups.
Conclusions: O positive was the most common and AB negative was the least common blood groups among different ethnic populations of Karachi.
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