[KLS2007]

I had an EMG/NCS this morning and have some questions. I had several of these about 15+ years ago for carpal tunnel syndrome and today's test didn't seem to be as thorough as the one I had done back then (different doctor).
That leads to my first question. They said they were doing this to rule out TOS. Even if the tests were negative, that doesn't necessarily rule out TOS does it? From all I've been reading, I didn't think there was a conclusive test for TOS or am I wrong about that?
I'm also wondering about the test itself. It seemed like most of the test was concentrated from the elbow down. They only positioned the electrode on the scalene area once and the needles were only inserted in my neck from about C5 & above. Is this normal? I had expected that they would be testing some in the brachial plexus area and the C8 area but those were completely avoided. I go back to my doctor Thursday and will get the results then but I just wanted to be prepared to ask the right questions.