- Abnormal bleeding (HP:0001892): An abnormal susceptibility to bleeding, often referred to as a bleeding diathesis. A bleeding diathesis may be related to vascular, platelet and coagulation defects. Evidence: IEA. (OMIM:227310)
- Reduced factor VIII activity (HP:0003125): Reduced activity of coagulation factor VIII. Factor VIII (fVIII) is a cofactor in the intrinsic clotting cascade that is activated to fVIIIa in the presence of minute quantities of thrombin. fVIIIa acts as a receptor, for factors IXa and X. Evidence: IEA. (OMIM:227310)
- Reduced coagulation factor V activity (HP:0003225): Decreased activity of coagulation factor V. Evidence: IEA. (OMIM:227310)
- Autosomal recessive inheritance (HP:0000007): A mode of inheritance that is observed for traits related to a gene encoded on one of the autosomes (i.e., the human chromosomes 1-22) in which a trait manifests in individuals with two pathogenic alleles, either homozygotes (two copies of the same mutant allele) or compound heterozygotes (whereby each copy of a gene has a distinct mutant allele). Evidence: IEA. (OMIM:227310)
These phenotypes are associated with the disease factor V and factor VIII, combined deficiency of, with normal protein C and protein C inhibitor (OMIM:227310).