MAC test, a bit of info -
[Diagnostic tests, such as EMG's or NCV's, may show non-specific abnormalities, but usually are normal in people with TOS. However, recently a new nerve test was found which has been abnormal in the large majority of patients with neurogenic TOS and pectoralis minor syndrome. This test can be considered a variation of EMG/NCV measurements. It is a determination of the medial antebrachial cutaneous nerve (abbreviated MAC). It is one of the few objective tests that can support the diagnosis.(Reported recently by Machanic, BI and Sanders, RJ in the Annals of Vascular Surgery,March,2008.)]
www.ecentral.com/members/rsanders/

http://www.researchgate.net/publicat...utlet_syndrome