Antidromic radial and median compound sensory nerve action potentials (CSNAP) were recorded from the index and middle fingers in 30 subjects, Eighty percent subjects had radial CSNAPs at the base of index finger, and had thirteen percent subjects at the base of middle finger. Sudden reduction was showed radial CSNAPs amplitude was small size and wide variability among individuals, Radial CSNAPs from index and middle fingers seem to have limited direct clinical utility, Contamination of median CSNAPs by radial CSNAPs is negligible or absent (when there is unavoidable spread of the stimulus to the radial nerve), if median sensory responses are recorded from the distal half (exept for PIP joint) of the index or middle finger.