[Distribution of ABO and Rh blood groups in Shaanxi Province and its formation by population migration]

Objective By investigating the distribution of ABO and Rh blood groups in Shaanxi Province, to discuss the influence of regional division and population migration on blood group distribution. Methods The data of 3 691 624 blood donors from 10 cities in Shaanxi province in the past 20 years was collected. According to the geographical characteristics of Shaanxi province, the data was divided into three regions: Northern Shaanxi, Southern Shaanxi, and Guanzhong, to statistically analyse the distribution of ABO and Rh blood groups across different regions. Heat map software was used to present the ABO blood group on Shaanxi map. The temporal and spatial characteristics of ABO blood group distribution during 2008 and 2018 were analysed and compared. Results ABO blood group distribution of Shaanxi people was O>B>A>AB, with a Rh negative ratio of 0.41%. Based on the ABO blood group distribution map of Shaanxi Province, obvious regional differences were found in ABO blood group distribution. The ABO blood group distribution in Guanzhong, Southern Shaanxi and Northern Shaanxi was B>O>A>AB, O>A>B>AB, and O>B>A>AB respectively, with the lowest proportion of type A being 26.12% in Northern Shaanxi, the lowest proportion of type B being 27.48% in Southern Shaanxi, and the highest proportion of type O being 32.60% and 32.10% in Northern Shaanxi and SouthernShaanxi respectively. Compared with 2008, the distribution of ABO blood groups in the three regions of Shaanxi province changed significantly in 2018. Conclusion The distribution of ABO blood group in Shaanxi province is O>B>A>AB in general. However, there are significant differences in blood group distribution among different regions. It was also found that population migration had an impact on blood group distribution from 1998 to 2018.