Allen Test

Test Overview

The blood supply to your hand normally comes from two arteries: the radial artery and the ulnar artery. A procedure called the Allen test can be used to find out if blood flow to your hand is normal. This test checks to see if both of these blood vessels are open and working correctly. It may be done before a blood draw, before a procedure that involves one of the arteries, or to help check for a blood flow problem.