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Patient guide · Neurophysiology

EMG, the nerve and muscle test explained - what to expect on the day.

EMG combines nerve conduction studies with fine-needle EMG. This shorter patient guide focuses on what to expect on the day - preparation, common questions, and what results mean.

A consultant clinical neurophysiologist performing an EMG in a private London clinic

Why patients choose us

  • 01

    The right hands

    We route you to a consultant clinical neurophysiologist - the person who performs the nerve conduction studies and needle EMG also interprets them.

  • 02

    Same-day preliminary

    A preliminary comment is usually given at the end of the appointment, with the full neurophysiology report to follow.

  • 03

    Independent, and free

    We are paid by no clinic, so the recommendation is impartial and costs you nothing.

Key facts

What an EMG is, at a glance.

The essentials before your appointment - duration, who performs it, what it detects and how quickly you’ll hear.

  • Definition

    Nerve conduction studies combined with fine-needle EMG.

  • Duration

    45–60 minute test.

  • Performed by

    Consultant clinical neurophysiologist.

  • Detects

    Nerve entrapment, radiculopathy, myopathy, MND, myasthenia.

  • Comfort

    Some discomfort, but tolerated by most patients.

  • Results

    Same-day preliminary result usual.

Preparation and steps

From referral to report - what happens, in order.

A 45–60 minute study with a short warm-up and no complicated preparation. One consultant performs the test and interprets it.

  1. 01

    Neurology referral

    A neurology or GP referral outlines the clinical question so the study is targeted from the start.

  2. 02

    Warm arms and legs before the test

    Warm limbs give faster, more accurate nerve conduction velocities - a hot shower or warm car helps.

  3. 03

    No moisturisers on skin

    Creams and oils interfere with surface electrode contact - arrive with clean, dry skin on the limbs to be tested.

  4. 04

    Nerve conduction studies (mild electric shocks)

    Small surface electrodes deliver brief, mild electrical pulses to measure how quickly and strongly nerves conduct.

  5. 05

    Fine needle EMG of muscles

    A very fine needle electrode is placed into selected muscles to record electrical activity at rest and with voluntary effort.

  6. 06

    Preliminary comment same day

    The consultant usually shares the headline finding at the end of the appointment, with any red flags escalated immediately.

  7. 07

    Detailed neurophysiology report

    A full written report from the reporting consultant is issued to your referrer, with images and traces available for review.

What it shows

What an EMG can, and can’t, see.

EMG answers a specific question - where in the nerve, root or muscle the problem sits. Imaging often follows to see the anatomy.

  • Carpal tunnel syndrome

    Median nerve slowing across the wrist - the classic EMG diagnosis.

  • Ulnar or peroneal neuropathy

    Focal entrapment at the elbow or fibular head, with denervation on needle EMG.

  • Radiculopathy

    Nerve-root irritation from disc disease - denervation in a myotomal pattern.

  • Motor neurone disease

    Widespread denervation and fasciculations across multiple regions on needle EMG.

  • Myasthenia gravis (repetitive stimulation)

    A characteristic decrement on repetitive nerve stimulation supports the diagnosis.

  • Myopathy

    Short-duration, low-amplitude motor unit potentials - the hallmark of muscle disease.

  • Peripheral neuropathy

    Length-dependent slowing or axonal loss - diabetic, inflammatory or toxic patterns.

  • Red flag: rapidly progressive weakness + fasciculations - urgent MND pathway

    Any suggestion of motor neurone disease triggers an accelerated onward referral the same day.

Next steps

What happens after the study.

Every EMG ends with a concrete next step, not just an answer. The onward pathway is decided by the finding, not the study alone.

  • Splinting and physiotherapy

    First-line conservative management for mild carpal tunnel and entrapment neuropathies.

  • Steroid injection

    Local corticosteroid for confirmed carpal tunnel or focal entrapment before surgery is considered.

  • Carpal tunnel decompression

    Definitive surgical release when symptoms persist or EMG shows significant denervation.

  • Neurology follow-up

    Onward consultant review to integrate the EMG with imaging and bloods.

  • MND multi-disciplinary care

    Coordinated neurology, respiratory, speech and specialist-nurse input for confirmed motor neurone disease.

  • Immunosuppression for myasthenia

    Pyridostigmine, steroids or steroid-sparing agents for confirmed myasthenia gravis.

  • Muscle biopsy for myopathy

    Targeted biopsy when EMG suggests an inflammatory or genetic muscle disease.

  • Structured follow-up

    A defined review interval - because most neuromuscular conditions evolve, and the plan should too.

Red flags

Findings that trigger an urgent pathway.

If any of these appear on the study, the case is escalated - the reporting consultant contacts your referrer on the same day.

  • Motor neurone disease

  • Guillain-Barré syndrome

  • Vasculitic neuropathy

  • Toxic neuropathy

  • Rapidly progressive weakness

  • Necrotising autoimmune myopathy

  • Compressive neuropathy with wasting

  • Bulbar-onset MND

  • Autoimmune plexopathy

Reading your report

A neurophysiology report can look intimidating. It isn’t.

Whatever the finding, the report keeps to the same four parts.

A consultant clinical neurophysiologist reviewing EMG traces on a clinical workstation in Central London

A quiet reminder

The report is written for your doctor, not for you - and that’s normal.

If you would like us to talk you through it before your follow-up, just ask.

  1. 01 Header

    Indication and clinical background

    Your details, the referral question, and the symptoms that shape interpretation.

  2. 02 Technique

    Nerves and muscles studied

    Which nerves were stimulated, which muscles were sampled, and any technical limitations.

  3. 03 Findings

    Nerve and muscle traces described

    Conduction velocities, amplitudes, motor unit morphology, spontaneous activity and recruitment.

  4. 04 Impression

    The conclusion: read this first

    Normal, focal entrapment, radiculopathy, generalised neuropathy, myopathy or motor neurone disease - with the next step.

Recognised by major UK insurers

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Cover depends on your policy and clinic; we confirm with your insurer before booking.

Frequently asked

Everything we get asked about EMG.

Quick answers on what the test involves, discomfort, preparation, turnaround and what abnormal results mean.

  • What does an EMG involve?

    EMG combines two tests. First, nerve conduction studies use small surface electrodes and brief mild electric pulses to measure how well nerves conduct. Second, fine needle EMG places a very thin needle electrode into selected muscles to record their electrical activity at rest and with effort.

  • Does an EMG hurt?

    There is some discomfort - the nerve conduction pulses feel like brief static shocks, and the fine needle EMG causes short, sharp sensations as muscles are sampled. Most patients tolerate it well and the whole test takes 45–60 minutes.

  • How should I prepare?

    Keep your arms and legs warm before the appointment - warm limbs give more accurate nerve conduction velocities. Don’t apply moisturisers, oils or creams to the skin on the day, and wear loose clothing that gives easy access to the limbs to be tested.

  • Will I get the result on the day?

    A preliminary comment is usually shared at the end of the appointment. The full written neurophysiology report follows shortly afterwards, sent to your referring consultant or GP.

  • Is EMG safe?

    Yes - nerve conduction studies use tiny, brief electrical pulses that are safe for essentially everyone. The fine needle EMG carries a very small risk of bruising. Tell the neurophysiologist if you take anticoagulants or have a pacemaker or implanted device.

  • What happens if the EMG is abnormal?

    The report specifies the pattern - focal entrapment, radiculopathy, generalised neuropathy, myopathy or motor neurone disease - and the concrete next step. That may be splinting, injection, surgery, immunosuppression or an onward neurology or MND pathway.

Sources

Clinical references.

Reviewed by Pulse Atlas Editorial Board () · Published 2026-07-30 · Next review 2027-07-30 · 5-minute read.

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In practice, in London

Booking EMG privately in London - what actually happens

With emg, the London question is usually about report turnaround and the radiologist reading it - not whether the scan is available. Waiting lists on the NHS for EMG vary widely by borough and by how the GP letter reads. Privately in London, we can normally offer a slot inside the same week, sometimes within 48 hours if there’s a cancellation. The difference isn’t clinical quality - the consultants are frequently the same faces you’d see on the NHS - it’s the calendar.

In practice, a private EMG appointment in London means a named consultant, a proper hour in the room (or the equivalent on a video call), and a report you can actually read. Most of the imaging suites and endoscopy units we use sit within a mile of Harley Street or in Chelsea and Fulham, and turnaround on findings is measured in days, not weeks. For emg specifically, the difference between a routine report and a sub-speciality read is where private care earns its keep.

We’re careful about what a private pathway for EMG can and can’t promise. It can compress a wait, put you in front of a subspecialist quickly, and get a proper report in your hands within a week. It can’t rewrite what the imaging or the bloods say. Setting that expectation up front tends to make the whole experience less stressful.

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