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    Nerve biopsy

    Biopsy - nerve

    A nerve biopsy is the removal of a small piece of a nerve for examination.

    A nerve biopsy is most often done on a nerve in the ankle, forearm, or along a rib.

    The health care provider will apply medicine to numb the area before the procedure. The doctor makes a small surgical cut and removes a piece of the nerve. The nerve sample is sent to a lab, where it is examined under a microscope.

    There is no special preparation.

    When the numbing medicine (local anesthetic) is injected, you will feel a prick and a mild sting. The biopsy site will be sore for a few days after the test.

    Nerve biopsy may be done to help diagnose:

    • Axon degeneration (destruction of the axon portion of the nerve cell)
    • Damage to the small nerves
    • Demyelination (destruction of parts of the myelin sheath covering the nerve)
    • Inflammatory nerve conditions (neuropathies)

    Additional conditions under which the test may be performed:

    • Alcoholic neuropathy
    • Axillary nerve dysfunction
    • Brachial plexopathy
    • Charcot-Marie-Tooth disease (hereditary)
    • Common peroneal nerve dysfunction
    • Distal median nerve dysfunction
    • Mononeuritis multiplex
    • Mononeuropathy
    • Necrotizing vasculitis
    • Neurosarcoidosis
    • Radial nerve dysfunction
    • Tibial nerve dysfunction

    Normal Results

    A normal result means the nerve appears normal.

    Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

    Abnormal results may be due to:

    • Amyloidosis (sural nerve biopsy is most often used)
    • Demyelination
    • Inflammation of the nerve
    • Leprosy
    • Loss of axon tissue
    • Metabolic neuropathies
    • Necrotizing vasculitis
    • Sarcoidosis

    • Allergic reaction to the local anesthetic
    • Discomfort after the procedure
    • Infection (a slight risk any time the skin is broken)
    • Permanent nerve damage (uncommon; minimized by careful site selection)

    Nerve biopsy is invasive and is useful only in certain situations. Talk to your doctor about your options.


    Shy ME. Peripheral neuropathies. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier. 2007: chap 446.

    Vallat, JM, Funalot, B, and Magy, L.Nerve biopsy: requirements for diagnosis and clinical value. Acta Neuropathol 2011, 121: 313-326.


    • Nerve biopsy


      • Nerve biopsy


      A Closer Look

        Self Care

          Tests for Nerve biopsy

          Review Date: 5/28/2013

          Reviewed By: Luc Jasmin, MD, PhD, FRCS (C), FACS, Department of Neurosurgery at Cedars-Sinai Medical Center, Los Angeles CA; Department of Surgery at Los Robles Hospital, Thousand Oaks CA; Department of Surgery at Ashland Community Hospital, Ashland OR; Department of Surgery at Cheyenne Regional Medical Center, Cheyenne WY; Department of Anatomy at UCSF, San Francisco CA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.

          The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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