Age
Amplitude (μV)
Conduction velocity (m/s)
Median nerve
Term newborn
≥3.5
≥22
0–1 month
≥3.5
≥24
1–3 months
≥5
≥25
3–6 months
≥5
≥32
6–12 months
≥5
≥33
1–2 years
≥9
≥41
2–4 years
≥13
≥45
4–6 years
≥14
≥48
Ulnar nerve
34–36 weeks gestation
–
≥10
Term neonate
≥4
≥13
2–4 weeks
≥6
≥17
1–3 months
≥6
≥20
3–6 months
≥6
≥26
6–12 months
≥6
≥28
1–3 years
≥6
≥29
4–6 years
≥6
≥33
Sural nerve
Term neonate
Any response
≥18
0–1 month
Any response
≥21
1–3 months
Any response
≥23
3–6 months
Any response
≥26
6–12 months
Any response
≥30
1–2 years
≥6
≥34
2–4 years
≥6
≥38
4–6 years
≥6
≥41
Medial plantar nerve
Term neonate
≥10
–
1–6 months
≥15
≥35
6–12 months
≥15
≥40
1–2 years
≥15
≥40
Table 24.2
Suggested normal values for motor nerve conduction studies
Age | Distal latency (ms) | Amplitude (mV) | Conduction velocity (m/s) |
|---|---|---|---|
Median nerve | |||
23–29 weeks gestation | Any response | ≥7 | |
29–33 weeks gestation | Any response | ≥16 | |
33–38 weeks gestation | ≤3.8 | Any response | ≥19 |
Term neonate (38–42) | ≤3.5 | ≥2.5 | ≥20 |
2–4 weeks | ≤3.0 | ≥2.5 | ≥23 |
1–6 months | ≤3.0 | ≥3.5 | ≥30 |
6–12 months | ≤3.0 | ≥2.3 | ≥35 |
12–18 months | ≤3.0 | ≥3.7 | ≥40 |
18–24 months | ≤3.0 | ≥3.7 | ≥45 |
2–3 years | ≤3.1 | ≥2.0 | ≥47 |
3–4 years | ≤3.1 | ≥2.0 | ≥48 |
4–5 years | ≤3.2 | ≥3.0 | ≥49 |
Adult | ≤4.5 | ≥4.1 | ≥49 |
Ulnar nerve | |||
34–37 week gestation | ≤3.0 | – | ≥15 |
Term neonate | ≤3.5 | ≥1.0 | ≥20 |
0–1 months | ≤3.5 | ≥2.0 | ≥20 |
1–6 months | ≤3.0 | ≥2.5 | ≥30 |
6–12 months | ≤2.5 | ≥3.0
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