Electromyographically, CTS is diagnosed when there is one or more of following parameters: difference between median and ulnar motor latency (DMLd) > 1.25ms (sensitivity: 91.8%), difference between median and ulnar sensory latency (DSLd) > 0.79ms (sensitivity: 93.34%), motor conduction velocity ratio (MCVr) < 90% (sensitivity: 95.9%), sensory conduction velocity ratio (SCVr) < 90% (sensitivity: 100%).