Microscopic hematuria, urinary red to deformities dominated. About 50% of patients with elevated serum IgA, but not with disease activity. Λ light chain in serum IgA concentration increased. Urine immunoglobulin no special significance. Most normal blood complement components. Certain factors or complement components may be reduced, mainly seen in the high incidence of familial tendency of patients, but is not diagnostic. About half of patients IgA- fibronectin aggregates measured values may have a transient increase, although help identify other kidney disease, but it has nothing to do with the disease activity, so there is no diagnostic value. 10% to 15% of patients may have IgA circulating immune complexes increased, 32% of patients with elevated IgA rheumatoid factor level. Number of immunological parameters, including the measurement results viruses and food antigens, antibodies, T cell subsets, HLA loci antigens may have changed, but no diagnostic value. 50% of patients the volar forearm skin biopsies were seen IgA and C3 deposition and other capillaries.
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