Muscle biopsy
A minor surgical procedure done under local anesthetic using a needle or a small incision to remove a small sample of muscle.
The procedure may be done to confirm a clinical diagnosis, distinguish between nerve and muscle disorders, identify a metabolic defect of muscle, diagnose diseases of connective tissue and blood vessels, detect muscle inflammation, or rule out muscle disease.
Afterwards, there may be minor discomfort and bruising at the biopsy site which usually takes a week to heal fully