oa The utility of the Difference of Latency of Median and Mixed Ulnar Nerve Action Potential in Focal Ulnar Nerve Neuropathy

Several electrophysiological tests have been used to diagnose focal ulnar nerve entrapment at the elbow, including evidence of focal motor slowing at the elbow, mixed ulnar nerve potentials across the elbow and comparing the results to the contralateral side; here I am trying to diagnose focal ulnar nerve neuropathy comparing the latencies of the median and ulnar nerves across the elbow.