[Donor selection for the production of factor XIII preparations].

For the purpose of establishing a programme of plasmapheresis for manufacturing preparations containing factor VIII, investigations were made to check the expediency of selecting donors. Factor VIII activity (Factor VIII: C) was determined in a total of 165 donors of plasmapheresis. Dependencies of factor-VIII: C on blood group, age and influence of smoking were examined. Depending on the blood group (0 less than A, B, AB) the results found by us showed significant differences in factor-VIII: C. The results are discussed and compared with data in literature. A selection of donors is considered to be reasonable. Increases in gaining factor-VIII are possible by making a pre-selection according to blood groups or better by exact testing respectively.