Dear 123rich

With regards the tests, I should think they are the same...just a matter of terminology I suppose.
Cervical Artery Dysfunction would be basically any abnormality in the arteries...VBI could be one of them...
I would say they are very much meaning the same thing...
the tests i presume are the same...there are other ways to assess whether these arteries are functioning properly...but I wouldnt think there is a difference between CAD and VBI testing...

I think these terms are not meaning the pathologies exactly but the state in which they are not able to supply blood to the brain effeciently...rather than pathology they suggest cause...wherein various reasons could be put under them
1) arthritic changes
2)posture...
3) primary arterial diseases compounded by the above
4) emboli...
several order reasons, I would take my mind off pathology and see these tests to mean cause of the ineffecient supply of blood to the brain...

have i been of help or have i added to the confusion?lol

cheers