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Allen Test: "Hold patient's hand with palm up. Have patient clench and unclench hand while occluding radial and ulnar arteries. The hand will become pale. Lower the hand and have patient relax the hand. While continuing to hold radial artery, release pressure on ulnar artery. Brisk return of color (5 to 7 seconds) demonstrates adequate ulnar blood flow. If pallor persists for more than 15 seconds, ulnar flow is inadequate and radial artery cannulation should not be attempted." - Jarvis
Release the occlusive pressure on the ulnar artery. You should notice a flushing of the hand within 5 to 15 seconds. This denotes that the ulnar artery if patent and has good blood flow. This normal flushing of the hand is considered to be a positive modified Allen’s test. A negative modified Allen’s test is one in which the hand does not flush within the specified time period
The Allen test - 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.
Allen’s Test - a check for alternative circulation Apply pressure to client’s ulnar and radial arteries at the SAME TIME; ask client to open and close hand, hand should blanch; release the pressure from the ulnar artery while continuing to compress the radial artery. Assess the color in the extremity distal to the pressure point - pinkness should return within 6 seconds [indicating that the ulnar artery is sufficient to provide hand with adequate circulation if radial artery is