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NCLEX-RN Exam Practice

Category - Respiratory

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You are planning to draw an arterial blood gas from your patient, but you must perform an Allen’s test first. You know that the Allen’s test is used to test what?

Popliteal circulation
Ulnar circulation
Femoral circulation
Carotid circulation

Explanation

Answer: B - The Allen’s test is used to test the ulnar circulation prior to drawing blood from an artery. This determines whether there is adequate collateral circulation to the hand prior to drawing the blood. If damage is done to the radial artery with ulnar circulation, the hand could suffer from severe ischemic injury.

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NCLEX-RN Exam Practice

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