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Adson's Maneuver

Examination type Neurological test (thoracic outlet syndrome)
Patient & Body Segment Positioning The patient is either seated or standing. Their arm needs to be easily accessible to the examiner.
Examiner Position The examiner stands behind the patient and a little towards the side. The examiner needs to be able to palpate the radial pulse of the patient.
Performing the Test The examiner starts off by palpating for the radial pulse of the patient. Once the pulse is found, the examiner will abduct, extend, and externally rotate the patient’s arm. The patient is then instructed to take a deep breath and turn their hand towards the involved shoulder.
Tissues Being Tested Compression of the thoracic neurovascular bundle, which includes the brachial plexus and subclavian artery and vein
Positive Test Diminishing or complete disappearance of the radial pulse indicates a positive test.
Interpretation A positive test for the Adson’s maneuver indicates the possibility of thoracic outlet syndrome.
Common errors in performing exam A common error in performing this test is to not continue palpating the radial pulse as the arm is moved. Also, some may turn the arm internally instead of externally.
Factors possibly resulting in misinterpretation A positive test may sometimes been found on a person who does not have thoracic outlet syndrome.
Related tests Roo’s Test, Wright Test or Maneuver, Costoclavicular Syndrome Test, Provocative Elevation Test, Shoulder Girdle Passive Elevation, Halstead Maneuver.
References

Booher, James M & Tibideau, Gary (2000) Athletic Injury Assessment  (4th ed). ST. Louis McGraw Hill. Pg.

Magee, David (2002) Orthopedic Physical Assessment Philadelphia Saunders. 
Links: http://www.tellmeabouttos.com/testing.htm
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