Together with findings on the physical examination and from the patient history, CSF analysis and electrodiagnostic studies can be helpful (but are not essential) to accurately diagnose CIDP.
CSF analysis reveals high protein levels in 90% of patients with CIDP. Nerve conduction studies can show acquired demyelination, and electromyography can demonstrate axonal loss if disease duration and severity are sufficient.
CTA of the head and neck and PT/aPTT are not helpful in diagnosing CIDP. However, when warranted, magnetic resonance imaging of the lumbar spine may assist in the diagnosis by revealing enlarged dorsal nerve roots.
Pertinent physical exam findings associated with CIDP alone are not sufficient to confirm a diagnosis of CIDP and rule out other etiologies.
For more on diagnosing CIDP, read here.
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Cite this: Jafar Kafaie. Fast Five Quiz: How Much Do You Know About Chronic Inflammatory Demyelinating Polyradiculoneuropathy? - Medscape - Feb 08, 2019.