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What is a nerve conduction study?

Nerve conduction studies or NCS pertains to the activation of nerves electrically using a dose of safe small sized pulses over a number of points on the skin most commonly on the limbs, followed by the measurement of the responses gathered. The responses or signals are typically measured starting from the particular nerve or from a muscle supplied by the activation of nerve. This unveils information about the health status of the nerve, muscle and neuromuscular junction, which is the part responsible for communication between the muscle and nerve.

  • What an NCV test will evaluate
  • What an EMG test will evaluate
  • What a Musculoskeletal Ultrasound test will evaluate
  • What a SSEP and a DEP test will evaluate

    • Continued ...Diagnostics is on the leading edge in providing mobile diagnostic testing. We perform all of the following test:

    NCVs - Nerve conduction velocity exams
    A nerve conduction velocity test or NCV examines the speed of electrical signals that move through a nerve. NCVs are used to diagnose nerve damage or tear, or even nerve destruction. The test is typically used to evaluate nerve or muscle diseases.

    EMG - Electromyogram, bilateral, upper and lower extremities
    An electromyogram or EMG is a test that measures the electrical activity of muscles when at rest and also during contraction. On the other hand, nerve conduction studies or NCVs measures how fast and how well the nerves are able to send electrical signals. Muscles are controlled by nerves by impulses or electrical signals. These same impulses make the muscles react in certain ways. When muscles react in abnormal ways it means that there is a disorder present.
    By measuring the electrical activity present in nerves and muscles we can help identify diseases that can damage nerves and or muscle tissue. Electromyogram's and nerve conduction studies are often done together for more precise and complete information.

    Musculoskeletal ultrasound
    Musculoskeletal ultrasounds involve the imaging and projection of muscles and skeleton. They usually involve the interaction of both, such as joints and tendons. Some of the reasons or conditions why a doctor or physician performs musculoskeletal ultrasounds include but are not limited to tendon problems, arthritis, joint pain, achilles tears, and bleeding within any muscles. Pretty much any form of injury or pain that involves muscles, tendons, ligaments, joints, and other soft tissue is a condition that may involve a musculoskeletal ultrasound.

    SSEP - Somatosensory Evoked Potential
    Somatosensory evoked potentials or SSEP's tests and evaluate the nerve pathway from the arms and legs, through the spinal cord, and to the brain. The signals determine whether the nerves connected to the spinal cord are capable of sending and receiving sensory information such as pain, temperature, and touch. When electrical tests are ordered to diagnose spine problems, an SSEP test may be combined with an electromyogram EMG, which as mentioned above tests how well the nerve roots leaving the spine are working.

    DEP - Dermatomal Evoked Potential
    Dermatomal evoked potentials or DEP's are performed in an analogous manner to standard SEP recordings with an exception that is the stimulating electrodes being placed over a dermatome rather than a specific nerve. DEP's involve recording cerebral evoked responses from cutaneous stimulation of areas of known dermatomal innervation. This provides a pure sensory input to any kind and any level of the spinal cord.