Physical examination maneuver
Physical Exam
Allen Test
also known as Modified Allen test
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Video coming September 2026
How to Perform
Ask the patient to clench the fist while you occlude both the radial and ulnar arteries at the wrist with firm finger pressure. Have the patient open the hand, which should appear pale, then release pressure over the ulnar artery while maintaining radial compression, and watch for the return of color to the hand. Repeat, releasing the radial side. Color returning within a few seconds is the normal result; color that fails to return (the palm stays pale) is the abnormal result.
How to Interpret
Showing 1 of 3 findings
Inadequate Hand Collateral Circulation
Delayed or absent return of palmar color after release of the ulnar artery (abnormal modified Allen test)
Rule in
Very helpful
Rule out
Somewhat helpful
Evidence:Strong