Direct immunofluorescence testing in vasculitis-A single institution experience with Henoch-Schönlein purpura.

LCV is an H&E-based histopathologic diagnosis that can have positive, negative and non-specific DIF results that are rarely contributory except in the setting of HSP, where DIF is best utilized with IgA as the sole immunoreactant. H&E-based triage of DIF orders is recommended.