The modified Allen test — which involves occlusion of both arteries to cause the hand to turn white and releasing pressure on the ulnar artery to see if the hand turns pink — is often used at ...

Despite its precision limitations, the modified Allen test, which consists of the manual occlusion of radial and ulnar arteries followed by the release of the latter and assessment of the coloring ...

The researchers compared the use of a heart-rate monitoring application (the Instant Heart Rate application version 4.5.0 on an iPhone 4S) with the modified Allen test, which measures blood flow ...