Von willebrands disease - there are 3 types and a platelet membrane disorder that mimics it. There is no need to memorize all of them. It suffices to know the following: Type 1 is the commonest, platelet count is normal. Treatment is Cryoprecipitate/Factor 8 concentrate.(To memorize this think that vWD makes me concentrate and cry)

4 things are abnormal

Bleeding time - prolonged

vWF - low

Ristocetin cofactor activity - low

Factor 8 activity - low