[Factor VIII-related antigen (F VIII R : Ag). Purification by immuno-affinity chromatography]

Immuno-affinity chromatography on immunoglobulins from a rabbit immunised with the plasma of a patient devoid of factor VII R : Ag allows the elimination of certain contaminants from preparations already enriched in factor VIII. The biological activity and criteria of purity of the factor VIII R : Ag preparation obtained are presented.