Etymology: Alfred W. Adson
a test for thoracic outlet syndrome. It is performed with the patient sitting with hands on the thighs. The examiner palpates both radial pulses as the patient takes a deep breath and holds it while extending the neck and turning the head toward the affected side. If the radial pulse on the affected side is significantly diminished or there is numbness or tingling in the hand, the result is regarded as positive.