Rare diseases · Sign or symptom

Myositis-specific autoantibody positivity

HP:6000678

What it means

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.

Part of the broader category

Myositis-specific autoantibody positivity

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This page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.