[Factor VIII activity and factor VIII associated antigen in newborns (author's transl)].

Factor VIII activity and factor VIII associated antigen were determined in healthy term newborns. On the first day of life factor VIII activity was higher than in adults. The activity reached the adult level at about the tenth day. The factor VIII associated antigen was found higher than the activity and did not decrease in the first ten days. Studies of the factor VIII associated antigen of newborns by the two-dimensional immunoelectrophoresis showed the same pattern as compared to adults.