Ulta Lab Tests

Ristocetin Cofactor Test

The Ristocetin Cofactor Test measures the activity of von Willebrand factor (vWF) in promoting platelet aggregation in response to ristocetin. Reduced activity may indicate von Willebrand disease or other platelet function disorders. This test helps assess clotting ability, investigate unexplained bleeding, and support the evaluation of inherited or acquired hemostatic abnormalities.

Blood
Blood Draw

The following is a list of what is included in the item above. Click the test(s) below to view what biomarkers are measured along with an explanation of what the biomarker is measuring.

Vwf: Ristocetin Co-Factor

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The Ristocetin Cofactor Test test contains 1 test with 1 biomarker .

von Willebrand Disease is the most common hereditary bleeding disorder. von Willebrand Factor is necessary for platelet adhesion to injured endothelium. Ristocetin cofactor is useful in assessing binding of von Willebrand Factor to platelet factor GP1b. When combined with other tests, results are useful in categorizing the type of von Willebrand Disease.

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