von Willebrand factor activity in plasma

Increases

• pregnancy & plasma estrogen
• stress
• exercise
• inflammation
• smoking

Decreases

• von Willbrand's disease with < 30% of normal
• persons with blood type O have 25% lower plasma vWF
• hypothyroidism

Specimen

• citrated plasma

More general terms

• clinical coagulation test

More specific terms

• ristocetin cofactor activity
• von Willebrand factor collagen-binding activity
• von Willebrand factor collagen-binding adhesion inhibitor

Additional terms

• von Willebrand factor; vWF; ristocetin cofactor; factor VIII related antigen; contains: von Willebrand antigen 2 (VWF, F8VWF)
• von-Willebrand's disease (vWD)