Nomogram for determining the lower normal limits for radial sensory nerve action potentials.

Introduction: In this study we aimed to determine the normal lower limits of sensory nerve action potential (SNAP) amplitude of the radial nerve by taking into account age, height, weight, and body mass index (BMI).

Methods: Three hundred thirty-four volunteers, 168 men and 166 women, were recruited. Sensory nerve conduction studies of the radial nerve were performed, and reproducible waveforms were obtained.