The modified Allen test is a simple test used to determine whether collateral blood flow exists to the hand. The modified Allen test is performed before collecting an arterial blood gas from the radial artery.

The test ensures that blood flow is adequate to the hand in case there is a problem during collection from the radial artery.

The modified Allen test is performed by occluding the radial and ulnar arteries with your thumbs. The patient can make a fist and open and close the hand. This will cause the skin color to lighten or become "blanched."

Next, you release pressure on the ulnar artery. if the hand returns to its normal color within 5 seconds, the result is considered normal. You can usually proceed with radial artery ABG sampling.

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