What should be performed prior to radial arterial blood sampling?

What should be performed prior to radial arterial blood sampling?

• A. Allen's Test
• B. Electrocardiogram
• C. Pulse oximetry
• D. Blood pressure cuff test

Answer: (A)

Before placing a radial arterial sample, you want to confirm that the hand will still be well perfused if the radial artery becomes occluded. This is checked with Allen's test, which evaluates collateral circulation through the ulnar artery. Have the patient clench their fist while you compress both the radial and ulnar arteries at the wrist, then release the ulnar artery to see if color returns quickly. A prompt reperfusion indicates adequate collateral flow and that radial sampling is unlikely to put the hand at risk for ischemia. If perfusion does not return promptly, avoid radial access or choose an alternative site to prevent ischemic injury. Other tests like ECG, pulse oximetry, or a blood pressure cuff test do not assess hand collateral circulation and aren’t substitutes for this assessment.

Before placing a radial arterial sample, you want to confirm that the hand will still be well perfused if the radial artery becomes occluded. This is checked with Allen's test, which evaluates collateral circulation through the ulnar artery. Have the patient clench their fist while you compress both the radial and ulnar arteries at the wrist, then release the ulnar artery to see if color returns quickly. A prompt reperfusion indicates adequate collateral flow and that radial sampling is unlikely to put the hand at risk for ischemia. If perfusion does not return promptly, avoid radial access or choose an alternative site to prevent ischemic injury. Other tests like ECG, pulse oximetry, or a blood pressure cuff test do not assess hand collateral circulation and aren’t substitutes for this assessment.