Optimizing the number of tests for carpal tunnel syndrome

The combined sensory index (CSI), the sum of three latency differences, med ian-ulnar across the palm (palmdiff), median-ulnar to the ring finger (ring diff), and median-radial to the thumb (thumbdiff), has higher sensitivity a nd reliability for carpal tunnel syndrome than individual tests. The object ive in this study was to develop an approach that minimizes testing but max imizes accuracy. We retrospectively studied 300 hands. There were endpoints for individual tests that confidently predicted the CSI; for ranges betwee n these endpoints, further testing was required. These ranges were: palmdif f 0-0.3 ms; ringdiff 0.1-0.4 ms; and thumbdiff 0.2-0.7 ms. One may use a st rategy in which more tests are performed when results are in these ranges. This approach can allow accurate diagnosis with fewer tests when values are extreme, yet uses the greater diagnostic power of more tests when values a re midrange. (C) 2000 John Wiley & Sons, Inc.