label: Myositis-specific autoantibody positivity
label_lc: myositis-specific autoantibody positivity
description: "The presence of autoantibodies (immunoglobulins) in the serum that display a high degree of specificity for idiopathic inflammatory myopathy (myositis-specific autoantibodies (MSAs)). MSAs are clinically useful biomarkers to help the diagnosis of polymyositis/dermatomyositis (PM/DM). Many of these are also associated with a unique clinical subset of PM/DM, making them useful in predicting and monitoring certain clinical manifestations."