Allen Test

Document Type

Article

Publication Title

StatPearls

Abstract

The Allen test is a screening technique that assesses collateral blood flow in the hands by evaluating the patency of the ulnar and radial arteries and the presence of a complete palmar arch. This clinical procedure is typically conducted to prepare for procedures that may potentially disrupt the vascular supply through the radial or ulnar arteries. Such procedures include arterial puncture, cannulation, and artery harvesting for forearm flaps or bypass grafting.

A negative Allen test suggests inadequate dual blood supply to the hand, warranting further pre-procedural evaluation. This may also contraindicate the planned procedure due to the increased risk of hand ischemia and arterial thrombosis. This activity reviews the relevant hand vascular anatomy, indications for performing the Allen test, technical steps, and the role of the interprofessional healthcare team in utilizing this maneuver to improve patient outcomes.

Publication Date

10-14-2024

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