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Diagnosis

If you and your GP think you may have CMT, you will be referred to a doctor who specialises in problems of the nerves, known as a neurologist.

Steps to a diagnosis

The neurologist will follow a number of steps to confirm whether you have the condition or not. The order of these steps may vary and some people will receive a diagnosis without needing to go through the whole process. Technology is changing rapidly, so the steps below should be seen as a guide rather than a blueprint.

Your doctor will take a standard patient history, including a family history. He or she will ask about your symptoms – what they are like and how long you have had them – and whether any of your family have CMT or have had similar symptoms.

hereditaryNext, you will be given a neurological examination. Your doctor will look for evidence of muscle weakness in the arms, legs, hands and feet; as well as signs of muscle wasting, reduced reflexes and any sensory loss. Your doctor will also look for any signs of foot problems – such as high arches, hammer toes, inverted heel or flat feet. Any sign of enlarged nerves will also be noted: these may be seen or felt through the skin.

If there is an established family history of CMT where a family member has already received a confirmed genetic diagnosis, then clinical assessment alone may be all that is needed to make a diagnosis. Sometimes you will be offered a genetic test for the most common form of CMT (type 1A). This might be the case where there is clear family history with typical signs of CMT, or where there are a long waiting lists for electro-diagnostic tests.

The next stage may be electro-diagnostic tests. These consist of two parts:

  • Nerve conduction tests. Electrodes are placed on your skin over your peripheral motor or sensory nerves, usually on the legs. These electrodes will give you a mild electrical shock, which may be uncomfortable – or occasionally painful. The shock stimulates your sensory and motor nerves and the doctor will be able to measure the speed at which the signal was transmitted and the size of the signal.
  • Electromyography (EMG). A needle electrode is inserted through your skin to measure the electrical activity of the muscles in the legs.

Nerve conductionElectrodiagnostic tests help doctors to distinguish between different types of CMT. If there is a test result for another member of your family with CMT, it may not be necessary for you to have an electrodiagnostic test.

In the UK, the next stage of diagnosis will be a genetic test to try to confirm which type of CMT you have. Not all the genes to do with CMT have been identified yet, or are commonly available to test, so this test may not be conclusive.

In very rare circumstances, when there is doubt about the precise diagnosis, nerve biopsy may be advised. This involves removing a small piece of peripheral nerve through a cut in the skin, usually from the calf, under local anaesthetic. The nerve is then examined in a laboratory for any signs of abnormalities.

What should happen now?

Once you have been diagnosed, certain things should happen.

You may find it useful to print out this list and talk it through with your neurologist and GP to make sure that you get the care you deserve.

  • You should receive a copy of your clinic letter. Ideally this will be phrased in such a way that you can show it to other family members. This will help them understand your diagnosis and why it would be a good idea for them to see a specialist too.
  • Appropriate follow-up arrangements should be offered to you..
  • Get a referral to see a physiotherapist with a good understanding of neuromuscular conditions and also to see an orthotist (a specialist in the use of mobility devices) if necessary.
  • Find out what to do if you discover other, new symptoms and how to check whether or not these symptoms are connected to CMT.

CMT can be well managed and well treated. But you may need to knock some heads together to get the care you deserve. If you are struggling to get the treatment you need, contact CMT United Kingdom.

Reacting to your diagnosis

Everyone reacts differently when told they or their child has CMT. Nobody – not your doctor, partner, family or friends – can tell you what you should or should not be feeling or how you should react

The important thing to remember is that an emotional response is perfectly normal and could include:

  • shock
  • denial
  • confusion
  • fear
  • wanting to avoid the issue
  • anger
  • grief
  • guilt
  • wanting to tell everyone – or no-one
  • relief

A feeling of relief upon diagnosis is quite common, as many people with CMT have lived with the symptoms of the condition for years before discovering the underlying cause. Learning that there is a name for what you have been experiencing can help you to understand and come to terms with your symptoms. Some people call this ‘closure’ – a sense of relief on diagnosis that the problems you have been living with for years are not symptoms of something more serious.

You may find it helpful to follow these five steps.

Take the time you need
Do not rush into important decisions about your health and life in general. You have time to think about your options and decide what is best for you.

Get the support you need
When you are ready, talk with your family and friends. Some people find it helpful to chat to other people with CMT: they are going through the same thing as you and may have ‘been there’ already. They may be able to help you make informed decisions.

Talk with your doctor and other medical staff
Try to strike up a good relationship with your doctor and other members of your healthcare team (neurologist, physiotherapist, etc.). Research shows that this can have a positive effect on symptoms and pain. It will also help you feel more satisfied with the care you receive.

Decide on a treatment plan
Work with your doctor and healthcare team to decide on a treatment and care plan that best suits you.

Remember, research shows that most people with a long-term condition like CMT do better if they are involved in decisions about their own healthcare.

Seek out information
Many people find that discovering as much as possible about CMT really helps. If this suits you – and it may not – then make sure you look for information that is based on the latest reviewed scientific findings.

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