<prompt> Allens test is used to diagnose:Thoracic outlet syndromePalmar arch insufficiencySuperior vena cava syndromeCoarctation of aorta  <response>: Ref: Bailey and Ones Short Practice of Surgery 25th EditionExplanation:Allens testIt is a test for the patency of the radial artery after insertion of an indwelling monitoring catheter. The patients hand is formed into a fist nd the ulnar artery is compressedcompression continues while the fist is opened.If blood perfusion through the radial artery is adequate, the hand should Hush and resume its normal pinkish coloration.Adsonks testIt is the loss of the radial pulse in the arm by- rotating head to the ipsi lateral side with extended neck following deep inspiration.It is seen in thoracic outlet syndrome TOS 