Your medical treatment team may be able to recommend a provider that has experience doing FCE's with people who have TOS. You likely will have to pay for it yourself but you will have a better chance of having a realistic estimate of your limitations. The FCE I had (done by someone recommended by my medical team) they measured TOS tests before and after typing and other tasks and were able to show changes in tests based on activity. I have never heard of this being done in FCE's paid for by insurance companies. I also saw my PT and doctor right before and right after the FCE and they commented on the objective signs of a flare up (swelling, TOS tests, etc.) and my reduced ability to do PT exercises. It's also documented in the records that the FCE caused a flare that lasted months.