Table 1.
Summary of electromyography and nerve conduction studies
| Tests | Normal value | Right | Left |
|---|---|---|---|
| Motor nerve conduction | |||
| DML (ms) | |||
| Median | ≤3.8 | 4.3 | 4.1 |
| Ulnar | ≤3.2 | 2.2 | 2.5 |
| Peroneal | ≤5 | 4.9 | 5.6 |
| Tibial | ≤4.5 | 5.7 | 6.5 |
| F waves (ulnar) | ≤30 | 33.5 | 34.3 |
| F waves (median) | ≤30 | 28.8 | 37.5 |
| F waves (tibial) | ≤50 | 55.3 | 61.3 |
| CMAP (mV) | |||
| Median | |||
| Wrist | ≥6 | 0.7 | 1.2 |
| Ulnar | |||
|
Wrist Below elbow Above elbow |
≥6 |
1.2 1.7 0.7 Proximal conduction block |
3.9 3 1.3 Proximal conduction block |
| Peroneal | ≥3 | 2.5 | 3.5 |
| Tibial | ≥6 | 0.2 | 0.4 |
| MCV (m/s) | |||
| Median | ≥45 | 57.6 | 51.6 |
| Ulnar | ≥45 | 55.3 | 56 |
| Peroneal | ≥42 | 42.6 | 41 |
| Tibial | ≥42 | 40.3 | 45.4 |
| Sensory nerve conduction | |||
| SNAP (mV) | |||
| Ulnar | ≥10 | 13 | 14 |
| Median | ≥15 | 7 | 7.5 |
| Radial | ≥15 | 11 | 15 |
| Sural | ≥10 | 6.4 | 11 |
| Musculocutaneous | ≥10 | 19 | 15 |
| SCV (m/s) | |||
| Ulnar | ≥45 | 56.3 | 57.8 |
| Median | ≥45 | 43.8 | 48.6 |
| Radial | ≥45 | 64.6 | 62.4 |
| Sural | ≥40 | 42 | 45.5 |
| Musculocutaneous | ≥40 | 54.3 | 57.4 |
DML, distal motor latency; CMAP, compound muscle action potential; MCV, motor nerve conduction velocity; SNAP, sensory nerve action potential; SCV, sensory conduction velocity; values marked in bold are above or below normal; values marked in bold underlined meet Rajabally’s criteria