Diagnostic test · Neurology
EMG and nerve conduction studies (EMG/NCS)
Electromyography (EMG) and nerve conduction studies (NCS) are tests that measure how well nerves and muscles are working. NCS sends small electrical pulses along a nerve. EMG uses a thin needle to record muscle activity. A neurologist may recommend them for numbness, weakness, or nerve pain.
Medically reviewed by Dr. Priya Raman, MBBS, MD, DM (Neurology) —
At a glance
The essentials.
- Practice
- Neurology
- Type
- Diagnostic test
The full guide
What it is
Electromyography (EMG) and nerve conduction studies (NCS) are tests that measure how well the nerves and muscles are working. NCS records how signals travel along a nerve. EMG records the electrical activity inside a muscle using a thin needle. The two are often done in the same appointment.
Why a neurologist may recommend it
A neurologist may recommend EMG and NCS for symptoms such as numbness, tingling, weakness, or nerve pain, to help find where the problem is and how the nerves and muscles are affected. The results guide the diagnosis and the plan.
How to prepare
Come with clean skin and avoid using cream or lotion on the day, so the sensors make good contact. Wear loose clothing. Tell the team beforehand if you take blood-thinning medicine, have a pacemaker or other implanted device, or have a bleeding problem.
Safety and what you may feel
EMG and NCS are low-risk tests. The pulses and the needle can be briefly uncomfortable. Serious problems are uncommon. The tests give information about nerve and muscle function at the time of the test, read together with your history and examination. If you develop sudden severe weakness, this website is not for emergencies; call 108 or go to the nearest emergency department.
Results and follow-up
A neurologist reviews the results and discusses what they mean at a follow-up, alongside your other findings, and explains the next steps.
Sources
NHS — Electromyography (EMG) and nerve conduction tests
National Institute of Neurological Disorders and Stroke — Health information
Before you come
What to bring and how to prepare
A short checklist to run through before your appointment. If anything here is unclear, call the clinic and ask.
- Come with clean skin and avoid using cream or lotion on the day, so the sensors make good contact.
- Wear loose clothing.
- Tell the team beforehand if you take blood-thinning medicine, have a pacemaker or other implanted device, or have a bleeding problem.
What happens
On the day.
What to expect from the moment you arrive to the moment you leave.
during
During the visit
During the NCS part: small sensors are placed on the skin and short electrical pulses are given along a nerve. The pulses feel like a quick tap or tingle.
after
Afterwards
During the EMG part: a thin needle is placed into one or more muscles to record their activity while at rest and during a gentle contraction. You may feel a brief ache.
after
Afterwards
you can return to your usual activities. There may be minor tenderness or a small bruise where the needle was used.
Before your appointment
Frequently asked questions
Practical answers about preparation, timing and what happens at the clinic.
Is EMG painful?
The electrical pulses in the nerve conduction part feel like a quick tap. The needle used in EMG can cause a brief ache. Most people manage the tests without difficulty.
Do I need to prepare?
Come with clean skin and no cream or lotion, and wear loose clothing. Tell the team if you take blood thinners or have an implanted device such as a pacemaker.
Where this fits
Related care and consulting times.
The conditions this is used alongside, and when the consultant sees patients at the clinic.
Consultation hours
- Neurology
- Mon, Wed, Fri, 5:30 PM–8:30 PM.
Medically reviewed by Dr. Priya Raman, MBBS, MD, DM (Neurology) —
Appointments
Plan your visit.
Mon, Wed, Fri, 5:30 PM–8:30 PM.