<p><b>Case 2 - Further Tests</b></p><p>Platelet aggregation : there was an abnormal response when his platelets were aggregated with ristocetin and ADP.</p><p>Factor VIII assay : revealed a plasma FVIII level 35% of normal.</p>

<p><i>Flat bed recorder print out of platelet abnormality with ristocetin.</i></p>
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<p><b>Glossary</b></p>
<p><i><b>Ristocetin</b> - is a drug which has been found to produce abnormal platelet aggregation when added in-vitro to the platelets of patients suffering from von Willebrand disease.</i></p>
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