There are several ways to diagnose myositis:

• Blood tests: To see inflammation and damaged muscle tissue.
• Anti-nuclear antibody test called ANA: to look for autoantibodies in the blood that attack nucleus portion of the cell.
• Extractable nuclear antigens ENA: is another type of autoantibody tests to determine the auto immune disease.
• Electromyography: Recording electrical messages in nerve endings that enables muscles to move. Any unusual activities in various muscles due to myositis helps to diagnose the condition.
• Muscle biopsy: To check inflammation muscle biopsy helps. It also involves looking for proteins that are responsible for the condition.
• Magnetic resonance imaging (MRI): Definitely will help to see swollen and inflammation of muscles. MRI also helps to see damaged muscles that are replaced by fat tissue. In addition, MRI picks up images of damaged ligaments, nerves and any problem in bones.

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