0008330 Reduced von Willebrand factor activity

0011871 Impaired ristocetin-induced platelet aggregation

0012147 Reduced quantity of Von Willebrand factor

0030129 Impaired ristocetin cofactor assay activity

0030130 Impaired von Willibrand factor collagen binding activity

0030131 Abnormal von Willebrand factor multimer distribution 5

0030136 Enhanced ristocetin cofactor assay activity

0040237 Impaired binding of factor VIII to VWF

0040240 Increased ratio of VWF propeptide to VWF antigen