NERVE CONDUCTION STUDIES: NORMAL ADULT VALUES
Upper extremity Studies
Motor Studies
*Distance measured calipers
NERVE CONDUCTION STUDIES: NORMAL ADULT VALUES
Upper extremity Studies
Antidromic Sensory
*Many consider ulnar antidromic sensory amplitudes that are higher than 10 µV to be normal in adults older 60.
1In these less commonly performed studies, side-to-side comparisons, especially of amplitude, often are more useful than the normal value tables, when symptoms and signs are limited to one side.
NERVE CONDUCTION STUDIES: NORMAL ADULT VALUES
Lower extremity Studies
Motor Studies
*Difficult to measure unless calipers are used.
1In cases where one side is symptomatic and the other is not, it is often helpful to compare the amplitudes side to side, rather than used normal value tables
NERVE CONDUCTION STUDIES: NORMAL ADULT VALUES
Lower extremity Studies
Antidromic Sensory
*In some normal individuals without symptoms, especially those older than age 40, these responses may be very small, requiring electronic averaging, or may be absent. Thus, a low-amplitude or absent potential should not necessarily be interpreted as abnormal. Side-to-side comparisons often are very useful in this regard in one side is symptomatic and the other is not.
1Alththogh the normal values for peak latency are based on the standard distance of 14 cm, in many individuals, it is much easier to stimulate at a shorter distance (typically 10-12 cm). Supramaximal stimulation usually can be achieved with low stimulation intensities (e.g., 5-25 mA). Thus, if the response is not present stimulating at 14 cm or if high currents are needed, try a shorter distance of 10-12 cm. If a good response is obtained, do not use the peak latency to determine if the response is normal, but rather the calculated conduction velocity based on the onset latency an the distance used.
2Although the normal value foe peak latency is based on the standard distance of 12 cm, in some individuals, the nerve may be easier to stimulate at a shorter distance (typically 10 cm). Difficult study to perform in obese individuals. Thus, a low-amplitude or absent potential should not necessarily be interpreted as abnormal unless side-to-side comparisons are done in patients whith symptoms limited to one side. Source: from Shin, Y.B., Park, J.H., Kwon, D.R., et al., 2006. Variability in conduction of the lateral femoral cutaneous nerve. Muscle Nerve 33 (5), 645-649. Values based on reported mean minus 2 SD for amplitude, and Variability in conduction of the lateral femoral cutaneous nerve. Muscle Nerve 33 (5), 645-649. Values based on reported mean minus 2 SD for amplitude, and mean plus 2 SD for peak latency.