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von Willebrand Disease (vWD)

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Diagnosis of von Willebrand Disease

Most of the cases of vWD are asymptomatic. Many children are diagnosed as a result of a positive family history or during routine preoperative screening (eg, prolonged bleeding time).

Physical examination usually reveals nonspecific evidence of easy bruising and bleeding. The diagnosis of vWD depends in large part on laboratory findings.

Bullet Bleeding time (is prolonged)

Bullet Platelet aggregation test

Bullet Platelet count (may be low or normal)

Bullet Ristocetin cofactor test (the primary assay test used to diagnose von Willebrand disease)

Bullet Von Willebrand factor level (level is reduced)

Complete blood count (CBC), Prothrombin time (PT) and Activated partial thromboplastin time (aPTT) are important investigations that give clues.

The results of the following tests may also be altered:

Bullet Factor VIII level

Bullet Von Willebrand factor multimers (parts of the von Willebrand factor protein molecule)

Gene-based assays are highly specific.

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