<prompt> Marker for the renal vasculitis in children isIncreased IgA levelLow complement levelAntineutrophilic cytoplasmic antibody titreIncrease antinuclear antibody  <response>: IgA nephropathy or Bergers disease affects children and young adult and is perhaps the most frequent type of glomerulonephritis in children.IgA nephropathy Berger nephropathy It is the most common type of glomerulonephritis worldwide.Children and young adults are commonly affected.It occurs after an upper respiratory tract infection or gastrointestinal infection.Clinical presentationGross hematuria within 1-2 days after on upper respiratory tract infection. This feature distinguishes it from PSGN. In PSGN hematuria occurs 7-21 days after respiratory infection.Can also present with nephritic or nephrotic syndrome.Mild to moderate hypertension.PathologyFocal and segmental mesangial proliferation.IgA deposition in the mesangium.Serum complement level is normal. This feature also differentiates it from PSGN. In PSGN complement C3 level is decreased.Whereas IgA nephropathy is isolated renal disease, similar IgA deposits are also found in systemic disorders of children like Henoch shonlein purpura, which also has renal vasculitis as a component fit view of the high frequency of IgA nephropathy in children, IgA can be used as a marker for renal vasculitis. 