Execution
- 1Ask the patient to rapidly open and close the hand several times, then squeeze the hand tightly.
- 2Compress both the radial and ulnar arteries at the wrist.
- 3Ask the patient to open the hand while maintaining arterial compression.
- 4Release pressure over one artery and observe how quickly the hand flushes.
- 5Repeat the same process for the other artery and compare both hands.
Positive outcome
Delayed reperfusion is positive. Magee gives expected flushing time as about 2.5 to 3.5 seconds for the radial artery and 2 to 3 seconds for the ulnar artery, with more than 6 seconds considered positive. The test assesses patency and dominant blood supply to the hand.
CommentAllen’s test is a vascular screening test, not an orthopedic diagnostic test for wrist pain. Technique matters because incomplete compression or patient motion can alter results. A positive or equivocal finding should be interpreted cautiously if decisions about arterial puncture, surgery, or vascular compromise are involved.
Low Clinical Value