Nerve Conduction Velocity Calculator

Nerve Conduction Velocity Calculator. Nerve conduction velocity (NCV) measures how fast electrical signals travel through a nerve — a key test for diagnosing conditions like carpal tunnel syndrome, neuropathy, and nerve damage. Enter the distance between electrodes and latency, then select your nerve type (motor, sensory, or mixed) and latency measurement method to calculate Nerve Conduction Velocity in m/s. Results also include a clinical interpretation, the expected normal range, and an optional temperature-corrected velocity if you provide skin temperature. Also try the calculate Progesterone to Estrogen Ratio.

Distance Between Electrodes *

Distance between stimulating and recording electrodes

Latency *

Time delay from stimulus to response

Nerve Type *

Latency Measurement Method *

Skin Temperature

°C

Temperature affects conduction velocity

Results

Nerve Conduction Velocity

Clinical Interpretation

Normal Range

Temperature Corrected Velocity

What is nerve conduction velocity and why is it measured?

Nerve conduction velocity (NCV) measures how fast electrical impulses travel through peripheral nerves. It's used to diagnose nerve damage, neuropathies, and conditions like carpal tunnel syndrome or diabetic neuropathy. See also our Body Surface Area (BSA) Calculator.

What factors affect nerve conduction velocity measurements?

Several factors influence NCV including temperature, age, nerve diameter, myelination, and the measurement technique used. Cooler temperatures slow conduction while warmer temperatures increase it.

What are normal nerve conduction velocity values?

Normal motor nerve conduction velocities typically range from 50-60 m/s for upper extremities and 40-50 m/s for lower extremities. Sensory nerves are generally faster at 50-70 m/s.

How do you measure latency for NCV calculations?

Latency can be measured to either the onset of the negative potential or to the negative peak. The onset method is more commonly used as it's less affected by temporal dispersion and provides more consistent results.

What does slow nerve conduction velocity indicate?

Slow NCV may indicate demyelinating conditions, peripheral neuropathy, nerve compression, or axonal damage. Values below 80% of normal suggest significant nerve dysfunction requiring further evaluation.

How does temperature affect nerve conduction velocity?

For every 1°C decrease in temperature, NCV decreases by approximately 2-2.5 m/s. This is why skin temperature should be maintained at 32°C or higher during testing for accurate results.

What's the difference between motor and sensory nerve conduction studies?

Motor NCV tests measure conduction in motor nerves that control muscles, while sensory NCV tests measure sensory nerves that carry sensation. Mixed nerves contain both motor and sensory fibers. You might also find our use the Oxygen Saturation Calculator useful.