Carpal tunnel syndrome (CTS) is the most common peripheral entrapment neuropathy with involving compression of the median nerve in the carpal tunnel. Although many conservative managements of CTS, the effectiveness of these methods is insignificant or only persist for a short duration. The platelet rich plasma (PRP) is a new and potential treatment for patients with kinds of musculoskeletal disorders and recent reports showed being beneficial for peripheral neuropathy in animal studies. Since 2014, four small clinical trials showed the positive effect of PRP in peripheral neuropathy. Among these studies, two small trials showed beneficial effect of PRP for patients with mild CTS. However, the definite clinical effect of PRP for peripheral neuropathy from currently published studies is unclarified because these studies enrolled a few patients and lacked long-term follow-up (no more than 6 months follow-up).