During the physical exam, your doctor may check for:
- Signs of muscle weakness in your arms, legs, hands and feet
- Decreased muscle bulk in your lower legs, resulting in an inverted champagne bottle appearance
- Reduced reflexes
- Sensory loss in your feet and hands
- Foot deformities, such as high arches or hammertoes
- Other orthopedic problems, such as mild scoliosis or hip dysplasia
Your doctor may also recommend the following tests, which can help provide information about the extent of your nerve damage and what may be causing it.
- Nerve conduction studies. These tests measure the strength and speed of electrical signals transmitted through your nerves. Electrodes on the skin deliver small electric shocks to stimulate the nerve. Delayed or weak responses may indicate a nerve disorder such as Charcot-Marie-Tooth disease.
- Electromyography (EMG). A thin needle electrode is inserted through your skin into the muscle. Electrical activity is measured as you relax and as you gently tighten the muscle. Your doctor may be able to determine the distribution of the disease by testing different muscles.
- Nerve biopsy. A small piece of peripheral nerve is taken from your calf through an incision in your skin. Laboratory analysis of the nerve distinguishes Charcot-Marie-Tooth disease from other nerve disorders.
- Genetic testing. These tests, which can detect the most common genetic defects known to cause Charcot-Marie-Tooth disease, are done by blood sample. Genetic testing may give people with the disorder more information for family planning. Recent advances in genetic testing have made it more affordable and comprehensive. It's important to have genetic counseling before undergoing genetic testing so you know the pros and cons of testing.
March 31, 2016
- Charcot-Marie-Tooth disease fact sheet. National Institute of Neurological Disorders and Stroke. http://www.ninds.nih.gov/disorders/charcot_marie_tooth/detail_charcot_marie_tooth.htm. Accessed Dec. 3, 2015.
- Facts about Charcot-Marie-Tooth disease and related diseases. Muscular Dystrophy Association. http://www.mda.org/publications/facts-about-charcot-marie-tooth-related-diseases. Accessed Dec. 3, 2015.
- Aminoff MJ, et al. Sensory disorders. In: Clinical Neurology. 8th ed. New York, N.Y.: The McGraw-Hill Companies; 2012. http://www.accessmedicine.com. Accessed Dec. 3, 2015.
- Cruse RP. Hereditary primary motor sensory neuropathies, including Charcot-Marie-Tooth disease. http://www.uptodate.com/home. Accessed Dec. 3, 2015.
- Ekins S, et al. A brief review of recent Charcot-Marie-Tooth research and priorities. F1000 Research. 2015;4:53.
- Klein C (expert opinion). Mayo Clinic, Rochester, Minn. Jan. 19, 2016.
- Verma A. Next-generation sequencing and diagnosis of Charcot-Marie-Tooth Disease disease. Annals of Indian Academy of Neurology. 2014 Oct-Dec; 17(4): 383–386.
- Important foot care for people with CMT. Charcot-Marie-Tooth Disease Association. http://www.cmtausa.org/resource-center/treatment-management/foot-care/important-foot-care-for-people-with-cmt/. Accessed Jan. 29, 2016.
- Pedicure pointers. American Podiatric Medical Association. http://www.apma.org/Learn/HealthyFeetTips.cfm?ItemNumber=9859. Accessed Jan. 29, 2016.