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Table 1 Classification of nerve conduction testing results

From: Treatment of carpal tunnel syndrome with wrist splinting: study protocol for a randomized placebo-controlled trial

Grade

Motor latencya

Sensory latencyb

Peak latency difference (index-small)c

Inter-peak latency

(ring)

Normal

Normal

<0.6

Single peak

Mild

Normal

≥0.6

≥0.6

Moderate

Abnormal

>1.2

>1.0

Severe

Abnormal

Absent response

Absent response

  1. All values are in milliseconds. A result is classified as abnormal if one or more criteria are present
  2. aDistal motor latency values according to age-based reference limits. (For example, values of more than 4.2 ms for age of 30 years and of more than 4.3 ms for age of 50 years are considered abnormal.)
  3. bMedian-ulnar sensory latency difference
  4. cIndex finger peak latency values above 3.8 ms (women) and 4.0 ms (men) are considered abnormal