Neuralgia

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There are a number of other laboratory tests doctors use to determine the cause of neuralgia. Blood tests to check blood sugar and kidney function are routinely used. When the diagnosis is not clear, other tests may be helpful -- particularly whenever there is suspicion of an underlying medical problem like arthritis, syphilis, vitamin deficiencies, or other less common disorders. If multiple sclerosis is suspected, the diagnosis usually can be confirmed with an imaging test of the brain such as an MRI.

A lumbar puncture (spinal tap) is often used to confirm the diagnosis of multiple sclerosis and other nerve disorders. It involves taking a sample of cerebrospinal fluid (CSF). Analysis of this fluid may show evidence of inflammation, helping to establish the correct diagnosis.