Electromyography (EMG)
Health Checkups
estimated about CNY 200-500
(estimated about USD 30-70)
30 min
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Description
Electromyography (EMG) helps diagnose nerve and muscle disorders like carpal tunnel or neuropathy; in China, it typically costs ¥200–¥500, and ChinaMedicalHub assists with hospital booking and interpreter support.
Main Uses
Electromyography (EMG) is primarily used to assess the health of muscles and the nerve cells that control them. It is commonly used to diagnose: 1. Neuromuscular disorders, 2. Nerve root compression, 3. Peripheral neuropathies, 4. Muscular dystrophies, 5. Motor neuron diseases. EMG is also useful in guiding treatment and monitoring the progression of neuromuscular conditions.
Normal Range
The normal range for Electromyography (EMG) varies based on the specific muscle and nerve being tested. Generally, a normal EMG shows no spontaneous electrical activity at rest, and motor unit potentials during slight contraction are typically between 200-500 microvolts with a duration of 5-15 milliseconds. Conduction velocities for sensory nerves usually range from 20-40 m/s, and for motor nerves, they can be 50-70 m/s or more, depending on the specific nerve.
Low Values - Possible Causes
Low values in EMG, often indicated by reduced conduction velocity or amplitude, can be caused by: 1. Peripheral neuropathy, 2. Axonal damage, 3. Myopathy, 4. Neuromuscular junction disorders, 5. Certain metabolic conditions affecting nerve function
High Values - Possible Causes
High values in EMG, such as increased spontaneous activity or abnormal motor unit action potential, can be due to: 1. Muscle diseases like myositis, 2. Denervation (e.g., from nerve injury or disease), 3. Neurogenic disorders, 4. Inflammatory processes, 5. Post-surgical changes
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