Diagnostic tests the doctor may order include: measurements of potassium, (K) creatine kinase,(CK) lactic dehydrogenase (LDH) and pyruvate kinase (PK) and certain antibodies in the blood; muscle tissue biopsy; and electromyogram (EMG).
Electromyogram: This activity measures small movements in the muscles including leg movements, facial movements and others which also help technicians to know if you are in REM sleep.
As part of this examination, imaging studies such as CT and MRI may be done and electrodiagnostic muscle function tests (electromyogram) or lumbar punctures may be ordered.
Nerve conduction studies and an electromyogram (EMG) are usually performed together to provide a comprehensive assessment of nerve and muscle function.
In the electromyogram, a very thin, sterilized needle is inserted into various muscles, usually those affected most by spasticity symptoms.