C4A and Henoch-Schoenlein purpura: All specific tests regarding Henoch-Schönlein Purpura (HSP) or IgA vasculitis and other types of vasculitis, including urinalysis, serum immunoglobulin A (IgA), coagulation tests, antineutrophil cytoplasmic antibodies (ANCA), serum complement levels (C3, C4), and liver function tests (LFTs), were insignificant and within normal ranges.