<prompt> A feature of Renal vaculitis in children is ?IgA raisedAntinuclear antibody in serumLow complement levelCytoplasmic antinuclear Ab in serum  <response>: Answer is A IgA Raised: The most common systemic vasculitis in children is Henoch Schonlein Purpura, and the most common primary glomerular disease is IgA Nephropathy. H.S purpura and IgA nephropathy may actually represent spectra of same disease and both are associated with elevated levels of IgA which is the single best answer of choice. Antinuclear Antibodies ANA and Antineutrophilic Cytoplasmic Antibodies ANCA are characteristicaly Negative and serum complement levels are typically normal. Laboratory Feature of Renal vasculitis in children due to HSP Serum IgA levels Elevated 60 of patients have an elevated serum IgA Antinuclear Antibody ANA Negative Antineutrophil cytoplasmic Negative Antibodies ANCA Complement C3, C4 Normal Even though immune complexes containing IgA are essential to the pathophvsiology of HSP, serum complement levels are usually normal Cryoglobulins Negative 