After reading an article by Dr. Brantigan, I ran across the name of the test. It's the Elevated Arm Stress Test (EAST). It's supposed to be the most reliable test for TOS. You extend both arms out to the side at shoulder height, then bend your elbows at a 90 degree angle pointing up, palms forward. Your shoulders and elbows should be aligned with your spine, not pulled forward (which is most comfortable for many). You then open and close your hands slowly over a 3-minute period. Most people can do it with forearm muscle fatigue only, but in TOS patients, it causes pain in the neck, shoulder, and arm, and tingling/numbness in the forearm and fingers. Your hands will turn white/blue, and you may have some swelling. Some TOS patients cannot complete the full 3 minutes.

Thanks for explaining that. I've had the EAST many times. I didn't know what it was called or referred to.