Myositis Disease Activity Assessment

Assess disease activity in inflammatory myopathies (dermatomyositis, polymyositis, IBM) using the Myositis Disease Activity Assessment Tool (MDAAT), covering extramuscular and muscular activity.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Assess disease activity in inflammatory myopathies (dermatomyositis, polymyositis, IBM) using the Myositis Disease Activity Assessment Tool (MDAAT), covering extramuscular and muscular activity

Each component has a specific meaning:

  • Covering extramuscular — The covering extramuscular recorded for the scenario being assessed.
  • Muscular activity — The muscular activity recorded for the scenario being assessed.

Note: Interpret the myositis activity result against the thresholds and context described above.

How to Use

Enter the covering extramuscular, muscular activity for the scenario you are assessing. Assess disease activity in inflammatory myopathies (dermatomyositis, polymyositis, IBM) using the Myositis Disease Activity Assessment Tool (MDAAT), covering extramuscular and muscular activity. Use the myositis activity result to inform your calculation.

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Frequently Asked Questions