MEASUREMENT WORKSHOP
Calculation workshop
Use example values to understand each formula. Results show calculations and units, without assigning a diagnosis.
Segmental motor conduction velocity
Velocity (m/s) = distance (mm) ÷ [proximal − distal onset latency] (ms)
Use two CMAP onset latencies and a measured segment distance, not peak or F-wave latencies.
RNS amplitude change
Decrement (%) = [first − comparison response] ÷ first response × 100
Use the same measurement definition. An increase is reported as increment. Separately document response number, exercise and acquisition conditions.
Comparative latency difference
Difference (ms) = latency A − latency B
Keep distance, latency definition and laboratory method consistent. No arbitrary diagnostic threshold is applied.
References and further reading
- Upper and Lower Extremity Nerve Conduction Studies (2023) ↗AANEM · Technical course · Link accessed 2026-09-08
- Electrodiagnostic reference values for upper and lower limb nerve conduction studies in adult populations (2016) ↗AANEM · Evidence-based reference data · Link accessed 2026-09-08
- Electrodiagnostic Studies in Neuromuscular Junction Disorders ↗AAPM&R KnowledgeNow · Society educational review · Link accessed 2026-09-08
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.