1. Superficial cutaneous or mucous membrane bleeding?
   1. low platelet count
      1. ITP
      2. Hereditary platelet disorder
      3. bone marrow failure
   2. normal platelet count? do PFA-100 (in vitro test for bleeding time)
      1. Abnormal
         1. vWD
         2. Liver disease
         3. hereditary or acquired platelet disorder
      2. Normal
         1. platelet d/o
         2. collagen vascular disease
         3. HSP

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