vertebral artery test vertebral artery test the vertebral artery test or wallenberg test is a physical exam for vertebral artery insufficiency. commonly, the va test involves cervical spine motion to an end-range position of rotation, extension or a combination of both. at this point, the physician assesses for vertebrobasilar insufficiency (vbi) symptoms. if the patient has vbi symptoms during the test, it is considered a positive result and a contraindication for cervical manipulation. the specifics of va testing vary among authors. the test is positive if the patient complains of dizziness, visual changes, or nystagmus occurs.