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Henoch Schonlein Purpura (HSP) is a systemic vasculitis of childhood with a reported occurrence of 10–20 cases per 100,000 children per year. HSP can present at any age, but is most common in children under five. Usually the prognosis is good, with the exception of those with significant renal involvement.
The primary aim of HSP follow up is distinguishing persistent renal inflammation, which undiagnosed, could develop to permanent renal damage. Due to the asymptomatic nature of HSP associated nephritis, unlike all other associated complications, most centers provide a program or a sequence of regular urine and blood pressure monitoring for up to 12 months.