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Here are some stats on Carpal Tunnel Syndrome:

50% of CTS claims are filed within the first year of employment 
15% of CTS claims are filed within the first three months of employment
The average CTS claim results in 34 lost work days
In the US there are approximately 260,000 CT operations each year; 47% are work related
Highest number of days lost among all worker’s comp claims
Annual cost of $80 billion to annual employers

Upper quadrant/CT tests are not used to diagnosek CTS. It’s performed only as a baseline test to identify abnormalities that have resulted in strength, motion, or sensory loss that correlate to pain or other symptoms consistent with common upper extremity problems and cumulative traumas like CTS. An employer with a candidate with CTS symptom magnification should engage with these candidates in the interactive process to determine if candidate can perform essential functions with or w/o reasonable accommodation or future medical risk. One alleviator for this is medical release from the candidates physician (that the candidate obtains on their dime). From there the physicians or specialist would determine if the candidate could perform the essential functions of the job without posing a medical risk.