Henoch-Schönlein purpura laboratory findings
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Laboratory findings
The diagnosis is based on the combination of the symptoms, as very few other diseases cause the same symptoms together. Blood tests may show elevated creatinine and urea levels (in kidney involvement), raised IgA levels (in about 50%), and raised C-reactive protein (CRP) or erythrocyte sedimentation rate (ESR) results; none are specific for Henoch-Schönlein purpura. The platelet count may be raised, and distinguishes the purpura from diseases in which the low platelets are the cause of the purpura (idiopathic thrombocytopenic purpura, thrombotic thrombocytopenic purpura).[1]