EMG/NCS Calculators

Terminal Latency Index

Assesses disproportionate distal slowing in the median nerve and others - CTS, anti-MAG, paraproteinemias.

Combined Sensory Index

Robinson index - integrates sensory latency differences across nerves.

Sural/Radial SNAP Ratio

Differential diagnosis of axonal polyneuropathy vs other causes.

Polyneuropathy Index

Brazil and Sweden normative models for PNP quantification.

USMAR

Ulnar SNAP/CMAP ratio - ganglionopathy vs polyneuropathy.

Split Hand Index

Electrophysiological biomarker for ALS - APB, FDI, and ADM comparison.

Neurophysiological Index

(CMAP/DML) × F-wave frequency - lower motor neuron loss in ALS.

F Wave and H Reflex

Age regression, Stålberg/Johnson, and height-based tables.

R/D Ratio - Facial Palsy

Reflex/Direct ratio from the Blink Reflex: intracranial vs. extracranial topography in peripheral facial palsy.

Brachial Plexopathy

NCS and EMG checklist in practice - upper, middle, and lower trunks.

CIDP Checklist

EAN/PNS 2021 electrodiagnostic criteria - median, ulnar, fibular, tibial.

SSEP Median and Tibial

Absolute latencies, interpeak intervals, and side-to-side difference - median (UE) and posterior tibial (LE).

SSEP Trigeminal

Trigeminal SEP: subcortical W₁–W₃, cortical N13/P19 - Cruccu/IFCN, Leandri, side-to-side asymmetry.

SSEP Pudendal Nerve

Pudendal SEP: P₁ (P40) with Haldeman, Opsomer, Cavalcanti BR and bulbocavernosus reflex (BCR).

SSEP Lateral Femoral Cutaneous

P31–N49 complex, amplitude, and Tibial P40 – LFC P31 gap (Synek, Liveson & Ma).

Pediatric EMG

Normative values by age band (0–18 years). Ref. Ryan et al. 2019.

Adult EMG Reference Values

Normative values by author or nerve - Ferrante, Kimura, Preston, AANEM, and others.