The Measurement of Antibodies to Extractable Nuclear Antigen

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Abstract
By the use of a combination of Ouchterlony immunodiffusion and hemagglutination, it was found that 30 of 81 sera (37%) from patients who had systemic lupus erythematosus (SLE) had antibody to the ribonucleoprotein component of extractable nuclear antigen, and 37 (46%) had antibody to the Sm antigen. Immunodiffusion was more sensitive for detection of anti-ribonucleoprotein, while hemagglutination detected more anti-Sm. Both technics are necessary to define qualitatively the types of antibodies present in SLE sera.