I had one Dr. just look for CTS on very short EMG's and he found CTs, But he never checked further and I had plexus, ulnar, radial and median nerve problems that went on worsening until new Dr. did full EMG and found the root of problem. They must check the whole arm and shoulder/neck areas with EMG. Some see lower problem and stop, thinking they found problem. I had 3 CTS surgeries based on this mistake and other problems worsened and CTS is even worse now.