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Efficient electrodiagnosis of polyneuropathy-a targeted three-nerve conduction study protocol
Orit Mazza1,2,3, Eyal Heled4,5, Mohammad Khamaisi5
1Department of Orthopedics, Loewenstein Rehabilitation Medical Center, Raanana, Israel.
Frontiers in Neurology
|August 12, 2026
Summary
A minimal three-nerve electrodiagnostic testing protocol, including sural sensory, tibial motor, and ulnar sensory/motor studies, effectively diagnoses polyneuropathy with high accuracy. This approach balances sensitivity and specificity for efficient clinical evaluation.
Area of Science:
- Neurology
- Clinical Electrophysiology
Background:
- Electrodiagnostic testing is crucial for evaluating polyneuropathy, but nerve selection and protocols vary widely.
- Standardized, efficient testing protocols are needed to improve diagnostic accuracy and sensitivity.
Purpose of the Study:
- To identify the minimum set of nerves for sensitive and accurate polyneuropathy diagnosis.
- To establish an optimal nerve conduction study protocol balancing sensitivity and specificity.
Main Methods:
- Retrospective cross-sectional cohort study comparing polyneuropathy patients with healthy controls.
- Matched analysis for age and sex, excluding confounding conditions.
- Logistic regression and ROC analyses to determine the most discriminative nerves and protocols.
Main Results:
- The sural and ulnar nerves showed the strongest sensory discriminators; tibial and ulnar nerves showed the most prominent motor abnormalities.
- A three-nerve protocol (sural sensory, tibial motor, ulnar sensory/motor) achieved an AUC of 0.916, with 80.5% sensitivity and 89.6% specificity.
- Adding contralateral ulnar sensory testing offered minimal improvement in AUC and reduced sensitivity.
Conclusions:
- A three-nerve protocol offers a favorable balance of sensitivity and specificity for diagnosing polyneuropathy.
- A stepwise approach, starting with unilateral sural, tibial, and ulnar studies, is recommended.
- Contralateral testing can be used selectively to enhance diagnostic confidence when necessary.
