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Diagnostic criteria

Authoring team

A diagnosis of dermatomyositis requires that five features are present:

  • proximal, symmetric muscle weakness
  • muscle biopsy evidence of myositis
  • elevation of serum muscle enzymes
  • characteristic electromyographic abnormalities
  • compatible skin involvement

Polymyositis requires only four features, there being no skin involvement.

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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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