Other
Nerve Conduction Study & EMG
Nerve conduction studies and EMG test how well your nerves and muscles are working, using small electrical pulses and fine needles, to find the cause of numbness, weakness or pain.
Quick answer
Nerve Conduction Study & EMG: what it is and what the results mean
These tests assess the nerves and muscles. A nerve conduction study measures how fast and strongly nerves carry signals using small electrical pulses on the skin, while an EMG (electromyography) records muscle activity using a fine needle.
- Why it is done: They are used to investigate numbness, tingling, weakness or pain, and to diagnose conditions such as carpal tunnel syndrome, trapped nerves, and disorders of the nerves or muscles.
- Understanding results: The results show whether nerves are conducting normally and whether muscles are working properly, helping pinpoint where and how severe a problem is.
What it is
These tests assess the nerves and muscles. A nerve conduction study measures how fast and strongly nerves carry signals using small electrical pulses on the skin, while an EMG (electromyography) records muscle activity using a fine needle.
Why it is done
They are used to investigate numbness, tingling, weakness or pain, and to diagnose conditions such as carpal tunnel syndrome, trapped nerves, and disorders of the nerves or muscles.
What to expect
For the nerve study, small pulses give brief tingling sensations. For the EMG, a fine needle is inserted into muscles, which can be briefly uncomfortable. Together they usually take 30–60 minutes.
Understanding the results
The results show whether nerves are conducting normally and whether muscles are working properly, helping pinpoint where and how severe a problem is. A specialist interprets them alongside your symptoms and examination.
Good to know
Risks and limitations
The tests are safe; the electrical pulses and needle can cause brief discomfort and occasionally minor bruising. Results are one part of the assessment and are combined with your history and other tests.
Education and reference only. This explains the test in general terms and is not medical advice. Always follow the specific instructions from the team arranging your test, and discuss your results with your clinician.
Answers
Nerve Conduction Study & EMG: frequently asked questions
Do nerve conduction studies hurt?
The small electrical pulses cause brief tingling that most people tolerate well, and the EMG needle can feel uncomfortable for a moment. Any discomfort is short-lived and settles quickly afterwards.
What conditions do these tests diagnose?
They help diagnose problems such as carpal tunnel syndrome, trapped or damaged nerves, and disorders affecting the nerves or muscles, by showing how well signals travel and how muscles respond.
Related tests
Other other investigations
Sources
Where this is drawn from
- NHS — Tests and treatments
- NICE — diagnostic guidance
- UK National Screening Committee / relevant professional body
Building patient-education content for tests or procedures?
We create clear, accurate, referenced medical explainers and decision aids for teams.