A patient with combined factor V and factor VII deficiency is described together with a family study. The pro positus appeared to be double heterozygous for factor V and factor VII deficiency. Since the patient showed a parallel de crease of activity and antigen, he appeared to be double het erozygous for a true deficiency. The patient had inherited the factor V defect from the mother and the factor VII defect from the father. The parents of the propositus were not consanguin eous. Other family members were found to have isolated factor V or factor VII deficiency. This is the third family so far described with this peculiar combined defect but the first to be investigated by clotting and immunologic assays.
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