The Allen test is used to evaluate collateral blood flow to the hands, usually in advance of a surgery that might affect the radial or ulnar arteries' ability to carry blood.
These treatments involve cannulating or puncturing the arteries, and either harvesting the arteries on their own or as part of a forearm flap. Through the ulnar and radial arteries of the wrist, the modified Allen's test evaluates the condition of the blood supply within the hand. Apply firm pressure to the radial and ulnar arteries close to the wrist crease to conduct the test.
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