The modified Allen test is used to determine collateral circulation in the:

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The modified Allen test is used to determine the adequacy of collateral circulation in the ulnar artery. The test involves occluding both the radial and ulnar arteries while the patient makes a fist, then releasing pressure on one of the arteries and assessing the time it takes for the hand to become pink again. If the hand becomes pink within 5-10 seconds, collateral circulation is considered adequate. This test is commonly performed prior to arterial blood gas sampling or during radial artery cannulation to ensure adequate blood flow to the hand.

The Modified Allen Test Is Used to Determine Collateral Circulation