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von Willebrand Factor Antigen

vWF:Ag vWF Antigen Factor VIII-related Antigen
Sodium citrate (blue top) % (IU/dL)

About this test

Quantitative measure of vWF protein. Used with vWF activity (ristocetin cofactor) and FVIII to classify von Willebrand disease subtypes.

Reference Ranges

Sex Age Range Notes
All ≥ 18 yrs 50 – 200 Adult; levels vary by blood group (lower in group O)

Clinical Interpretation

Low / Decreased
Low — von Willebrand disease (type 1, 2, or 3), blood group O (physiological), hypothyroidism, post-plasma exchange.
High / Increased
Elevated — acute-phase reaction (vWF is an acute-phase protein), pregnancy, cardiovascular disease.
Specimen
Sodium citrate (blue top)
Reporting Unit
% (IU/dL)
Category
🩹 Coagulation

⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.