This how-to video demonstrates how to test radial and ulnar artery circulation. To begin have the patient clench the hand tightly. Upon release the blood should return quickly. If you push down on both arteries, specifically the radial side, the hand remains white after loosening the clenched hand. If you release the ulnar side you will notice that the hand returns to a normal pink color. Follow along and learn to test radial and ulnar artery circulation.