The diagnostic significance of combined detection of four autoantibodies in systemic lupus erythematosus

Objective To investigate the diagnostic significance of combined detection of anti-double stranded DNA antibody(anti-dsDNA),anti-Smith antibody(anti-Sm)and antinuclesome antibody(AnuA) and anti-histone antibody in systemic lupus erythematosus(SLE),and evaluate the significance of combined detection of these autoantibodies in the diagnosis of SLE. Methods Ninety-eight cases of SLE patients who were divided into active and stable stage group and 90 disease controls and 40 healthy people were detected with Euro immunoblot assay.Results In the assays mentioned above. The serum positive rates of anti-dsDNA,anti-Sm, AnuA and anti-histone antibody were 45.9%,29.6%,57.1% and 33.1% in SLE, and the specificities were 100%,99.2%,98.5% and 89.2% respectively in patients with SLE.The positive rates of anti-dsDNA and AnuA in active SLE group were 57.5%,65.1%,which was apparently higher than that in the stable stage group;The sensibility of combined detection of anti-dsDNA and AnuA was 70.4%, four autoantibodies combined detection in SLE was 79.6%, which was apparently higher than any single autoantibodies, the difference had statistical significance. Conclusions These four autoantibodies have very high sensibility and specificity respectively, combined detection of four autoantibodies can markedly raise the relevance ratio in SLE, while their specificity didn't have a visual reduction. Especially, the sensibility of combined detection of anti-dsDNA and AnuA can markedly increased in active SLE patients. This compose can raise effectively the diagnosis of active SLE.So the detections of the four antibodies are complementary for the diagnosis of SLE. Key words: Systemic lupus erythematosus ;  Anti-double stranded DNA antibody ;  Anti-Smith antibody ;  Antinuclesome antibody ;  Anti-histone antibody ;  Sensibility ;  Specificity ;