<prompt> Adson test used for determining vascular insuffciency. It is useful inPeripheral vascular diseaseVaricose veinsCervical ribAV fistula  <response>: Adsons Test Scalene Test Instruction Patient is instructed to take a deep breath and hold it Extend the neck fully Turn face towards the side Inference Maneuver tightens the anterior middle Scalene muscles thus decreasing the interscalene space magnifying any pre existing compression Obliteration or diminution of radial pulse suggests the diagnosis Ref: Sabiston 20th edition Pgno :1603 