Foundations · Beginner

Reference limits need context

Method-matched reference limits

Match the population and technique before consulting a numerical limit.

3 learning sectionsCompiled 2026-09-08English edition · Traditional Chinese available

01Match the method

  • Nerve, distance, sensory versus mixed technique and cursor definitions must agree.
  • Antidromic versus orthodromic recordings, different digits and different muscles cannot share every limit.

02Match the person

  • Age, height, BMI and other population characteristics may affect reference distributions.
  • Adult data are not pediatric standards. Some distal sensory responses are smaller in older adults.

03Handle borderline results

  • A reference boundary is a distributional limit, not an automatic disease diagnosis.
  • Same-hand or contralateral comparisons reduce some confounders but still need matched methods and appropriate limits.

Pause and explain

Explain in your own words: “Read the table footnotes before reading the numbers.” Then think of a situation in which it could be misinterpreted.

Show a review prompt

Advanced nerves require dedicated laboratory data; this atlas does not claim universal limits for every nerve.

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References and further reading

Educational synthesis; independent neuromuscular specialist review is pending. Publication dates and compilation dates are distinct. This is an original teaching synthesis; consult the source for complete methods and criteria.