694bb179_WRIST__2
[0] Allen Test [1] Instruct the athlete to make a tight fist and open it fully three or four times. [3] While the athlete is holding the last fist, the evaluator places compression on either the radial or ulnar artery. If upon release, blood fails to return to the palm and fingers, an obstruction to the artery's blood flow is possible. [2] 
This test determines whether or not the radial and ulnar arteries are supplying the hand to their full capacities.
WRIST