How is Von Willebrand Disease diagnosed?

TL;DR: Von Willebrand Disease (VWD) is diagnosed through a combination of a detailed personal and family bleeding history and specialized blood tests that measure the levels and functionality of the von Willebrand factor (VWF) protein. Because symptoms can be mild, particularly in the most common types, diagnosis often requires repeated testing and evaluation by a hematologist to confirm the specific subtype.

How is Von Willebrand Disease diagnosed?

The diagnostic process for Von Willebrand Disease typically begins with an assessment of your bleeding history, such as frequent nosebleeds, heavy menstrual bleeding, or prolonged bleeding after minor surgeries or dental work. Clinicians use standardized bleeding assessment tools (BATs) to quantify this history. Following the initial screening, a series of specific blood tests are ordered to evaluate the coagulation system. Diagnosing Von Willebrand Disease is nuanced because VWF levels can fluctuate due to stress, pregnancy, exercise, or inflammation, often necessitating multiple blood draws to confirm a diagnosis.

What specific tests are used to identify Von Willebrand Disease?

To confirm Von Willebrand Disease, physicians look for both the quantity and the quality of the VWF protein. The most common laboratory tests include:

• VWF Antigen (VWF:Ag): Measures the total amount of von Willebrand factor protein in the blood.


• VWF Activity (Ristocetin Cofactor Activity or GPIbM): Measures how well the VWF protein functions in helping blood clot.


• Factor VIII Activity: VWF acts as a carrier for Factor VIII; low levels of VWF often lead to secondary reductions in Factor VIII.


• VWF Multimer Analysis: Used to distinguish between the different subtypes (Type 1, 2, or 3) by examining the structure of the protein.


• Genetic Testing: While not always required for diagnosis, genetic sequencing can help identify the specific mutation, which is particularly useful for distinguishing between complex subtypes.

Why is there often a delay in diagnosing Von Willebrand Disease?

Many patients face a "diagnostic odyssey" because Von Willebrand Disease is frequently misdiagnosed as simple iron-deficiency anemia or dismissed as "heavy periods" in women. Because the condition is common—affecting approximately 1 in 1,000 people—but often presents with subtle symptoms, primary care physicians may not immediately suspect a bleeding disorder. It is common for patients to spend years seeking answers before being referred to a hematologist. At DiseaseMaps.org, 184 community members have shared their experiences, many noting that persistence in seeking specialist care was the turning point in their journey.

Which medical specialists should manage this condition?

If you suspect you have Von Willebrand Disease, it is essential to consult a hematologist, specifically one who specializes in bleeding and clotting disorders. These specialists are best equipped to differentiate Von Willebrand Disease from other conditions, such as hemophilia, platelet function disorders, or acquired von Willebrand syndrome. If your local doctors are unfamiliar with the condition, do not hesitate to seek a second opinion at a Hemophilia Treatment Center (HTC) or a major academic medical center.

Next steps

• Keep a detailed log of all bleeding episodes, including duration and intensity, to share with your specialist.


• Ask your primary physician for a referral to a hematologist or a board-certified specialist in coagulation disorders.


• Connect with the 184 members of the DiseaseMaps.org community to share experiences and find support.


• Request copies of your laboratory reports to ensure you have a clear record of your VWF activity levels.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• National Institutes of Health (NIH) Genetic and Rare Diseases (GARD) Information Center: Von Willebrand Disease.


• Orphanet: Von Willebrand disease (ORPHA:900).


• World Federation of Hemophilia (WFH): Guidelines for the Management of Von Willebrand Disease.


• OMIM (Online Mendelian Inheritance in Man): Von Willebrand Factor; VWF (MIM #193400).