Allen's test
（重定向自Allen test）
![Arteries of the hand](/Images/godic/202412/18/Gray1237.svg1037.png")
In medicine, the Modified Allen's test, also the Modified Allen test,
The Allen's test is testing for abnormal circulation. If color returns as described above, the Allen's test is considered to be "Positive". If color fails to return, the test is considered "Negative" and the ulnar artery supply to the hand is not sufficient. The radial artery therefore cannot be safely pricked/cannulated.