Von Willebrand Factor (vWF) Antigen Test

A blood sample is used in this test.

This test is usually ordered when you have symptoms of a bleeding disorder, such as frequent nosebleeds, heavy or prolonged menstrual bleeding, prolonged bleeding after surgery or injury, or unexpected bleeding after childbirth.

This test measures the level of von Willebrand Factor, a protein that plays a key role in blood clotting, in your blood.

The frequency of testing depends on your health condition and the decision of your healthcare provider.

Normal values typically range between 50% and 200%, but these can vary depending on the laboratory.

There are no specific precautions you need to take before this test.

Factors such as medications, pregnancy, and the presence of an inflammatory or autoimmune condition can affect vWF levels.

If your test results are abnormal, you should consult a hematologist or your primary healthcare provider.

No specific preparation is necessary for this test.

Certain medications such as birth control pills, hormone replacement therapy, or blood thinners can affect vWF levels.

Non-modifiable factors include genetic conditions like von Willebrand Disease and other blood clotting disorders.

The pain experienced during a blood draw varies among individuals. You may feel a quick, sharp pinch as the needle pierces your skin, followed by a slight throbbing, pressure, or mild discomfort.

This test is considered very reliable in detecting abnormal levels of vWF, particularly when combined with the patient's medical history, symptoms, and other diagnostic tests.

Other tests that might be done along with the vWF antigen test include vWF activity tests and factor VIII coagulant activity tests. These additional tests can provide a more comprehensive view of your clotting function.

High levels of vWF can increase the risk of developing abnormal blood clots, potentially leading to conditions such as deep vein thrombosis or stroke. If your vWF levels are too high, your healthcare provider may recommend additional tests or treatment to manage this risk.

Low levels of vWF can cause prolonged bleeding since the blood is not clotting as it should. This condition is most often associated with von Willebrand disease, a genetic disorder that affects the blood's ability to clot.

Yes, the vWF antigen test is safe for pregnant women. However, pregnancy can naturally increase vWF levels, which should be considered when interpreting the test results.

Getting the vWF antigen test can be a crucial step in diagnosing bleeding disorders. If you experience unusual or prolonged bleeding, you should discuss this test with your healthcare provider. It can help guide appropriate treatment strategies to manage your symptoms effectively.