Anti Jo-1 antibodies

Does the presence of these antibodies confirm polymyositis? ANA positive, elevated C-reactive protein, elevated sed.rate, symptoms of fibromyalgia, chronic fatigue (debilitating)…7 year history of connective tissue disease, undifferentiated with symptoms including neuropathy. No elevation in CK presently. Results of Jo-1 was “500″ with reference range of >120 being positive. LE neg., HIV neg. as well as anti ro, Sm, DNA, negative.