ABSTRACT
Background: Glomerulonephritis (GN) remains a common cause of end stage kidney failure worldwide. The auto antibodies are useful in the patients prognosing, diagnose and treatment of GN. The aim of the study was to compare the prevalence and levels of auto antibodies in the sera of patients with GN in relation to the clinical activity of disease and auto antibodiesMethods: From a hospital-based population, 90 patients with GN (mean age 37.9±12.7) were recruited. Autoantibodies (C/P-ANCA, anti-dsDNA, anti-Sm, anti-SS-A/Ro, anti-SS-B/La, anti-Scl-70, anti-GBM) measured by Enzyme Immuno Assay (Germany, ORGENTEC Diagnostika GmbH). Renal function was evaluated by the eGFR using the Cockcroft-Gault formula.Results: Patients with GN was significantly younger and primary GN was more common in the male, but frequency of LN was 4 times higher among female. The prevalence of cANCA 2.9%, Sm 4.2%, dsDNA 5.7%, SSA 7.1%, SSB 1.4% were positive in primary GN group, the prevalence of Sm 16.7%, dsDNA 8.3%, SSA 25%, SSB 16.7% were positive in secondary GN group. A higher frequency of anti Sm 25%, anti-dsDNA 25%, anti-SS-A/Ro 75%, anti-SS-B/La 25% was observed in the lupus nephritis group. Conclusion: Lupus nephritis associated with several auto antibodies (anti Sm, anti-dsDNA, anti-SS-A/ Ro, anti-SS-B/La) and each of which are very useful in distinguishing patients with lupus nephritis from other secondary GN.