[Serum immunoglobulin content in donors as related to the ABO blood group]

The content of IgG and IgM has been studied in the sera of 120 donors making up 4 groups of 30 subjects each in accordance with the ABO blood grouping. As regards the amount of immunoglobulins of different classes in the serum of donors having blood of different groups, the donors with group O blood have shown the highest content of IgA and the lowest content of IgM, inthe donors with group A blood the highest content of IgA and the lowest content of IgM, in the donors with group A blood the highest content of IgG and the lowest content of IgA have been established, and the donors with group B blood have been found to have the maximum content of IgM and the low content of IgG. The donors with group AB blood have been found to occupy an intermediate position, being similar to the donors with group B blood in the content of IgG and IgA in their sera and to the donors with group A blood in the content of IgM.