Adson’s sign or Adson’s maneuver is used to diagnose thoracic outlet syndrome. The clinician has the patient extend their neck and turn their head to the side that is being tested. The patient then holds their breath and the radial pulse is palpated. If the pulse decreases then vascular compromise is present suggesting thoracic outlet syndrome. Alternatively, auscultation of the subclavian artery can be done. The Adson’s maneuver would cause a subclavian artery bruit to be heard if positive.