Central motor conduction time

Need to know

• What happens icon plus

  Central motor conduction time (CMCT) is the time it takes for neural impulses (electrical signals) to travel through the central nervous system on their way to target muscles. It is a diagnostic test used by consultants to assess the function of your central nervous system, motor and sensory nerves. An electrode is placed on your skin (usually your hand, arm or leg) and then another electrode stimulates the area. It produces small electrical pulses and you may feel like a tapping sensation. The process is repeated for different nerves. The test takes between 30 minutes and an hour.

• How to prepare icon plus

  Before your appointment, it is advisable to wear loose-fitting clothing and remove any jewellery that may get in the way. You should avoid using any moisturising creams or lotions on the day of the test as they may interfere with the test. It's important your hands and feet are warm, cold limbs may affect the result. You can eat and drink normally before your appointment.

• Afterwards icon plus

  There are no side effects of the central motor conduction time test, although you might find the sensations a little uncomfortable. You will be able to leave the hospital immediately after your tests have been completed and can eat and drink normally afterwards. Your consultant will get in touch with you to discuss your results and any relevant treatment options.