Sorry the type ended up so small.

I tried to edit it larger, but it didn't allow me to do so.

No, there is not a definitive, for sure, TOS test.

Your symptoms sound like TOS. TOS and cervical issues are very, very hard to separate and identify. The best tests would be a scalene block and the EMG / nerve test of the C-8 nerve. But you could still have those come out normal, or not have too much of a reaction to the scalene block, and still have TOS.

Best of luck to you on your healing path. TOS for me is horribly painful, and I am bedridden 95% of the time right now because of the pain.