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Henoch-Schönlein purpura (HSP) is a common, benign vasculitis in childhood which occasionally follows a protracted course and prolonged length of hospital stay. We aimed to determine clinical and laboratory characteristics that allow prediction of prolonged length of hospital stay (4 or more days) in HSP patients. We have retrospectively reviewed all HSP cases that were admitted to the Dana Duek Children’s hospital between 2000 and 2013. Univariable analysis was performed to study the variables that were statistically related to length of hospital stay. These variables along with other clinically relevant variables were analyzed using stepwise backward multiple regression analysis. Variables that remained significant in the final analysis were correlated with length of stay, were each given specific weight (according to their contribution to the final R ²) and were used to assemble an HSP …