The Allen test is used before radial arterial line placement to assess
a. collateral circulation to the hand. c. neurologic function of the hand.
b. patency of the radial artery. d. pain sensation at the insertion point.
A
The Allen test involves occluding the radial or ulnar artery after blanching the hand. If the hand turns pink, then the nonoccluded artery provides enough circulation to the hand. If the hand remains blanched, then no collateral circulation exists, and that wrist should not be used for arterial line placement.
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