ABO blood group distribution and infertility risk in Southern China: a retrospective analysis of the Ganzhou Region

Blood group O-particularly the O/O couple combination-may be associated with an increased risk of infertility, whereas combinations involving B or AB blood groups may confer a potential protective effect. The ABO blood group type may influence male fertility, partly through its association with sperm morphology. These findings provide region-specific evidence and underscore the need for large-scale, multi-center studies to further validate the observed associations.