A nurse performs an Allen test before performing the arterial stick for an arterial blood gas.What does this test assess?

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The Allen test is performed before an arterial blood gas test to assess the perfusion of the hand. The nurse will apply pressure to both the radial and ulnar arteries in the wrist, then release pressure on one artery while continuing to occlude the other. This allows blood flow to be assessed in each artery to make sure there is adequate perfusion before the arterial stick. This helps to prevent arterial damage, thrombosis or occlusion.

A Nurse Performs an Allen Test Before Performing the Arterial