- purpura in Henoch scholein purpura is due to vasculitis and not due to thrombocytopenia.
- small and medium sized vessels involved.
- usally seen in children (infact it is the most common small vessel vasculitis in children ).
- vasculitis is caused by immune complex deposition.
- most common antibody seen in these immune complexes is IgA. (IgA levels are elevated.)
- platelet count is normal
- sr complement level is normal
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