I conducted a nerve conduction study on a 45-year-old man for whom the referring provider expressed concerns regarding peripheral neuropathy. The results revealed the absence of sural sensory and superficial fibular sensory responses on the left side. However, other nerve conduction studies, including fibular motor to EDB and TA, tibial motor, ulnar motor, and superficial radial sensory on the same side, were normal, along with needle EMG. What steps should I take next, and what conclusions can be drawn from this study?