The purpose of an Allen test is to check blood flow in the _____ artery. 1. ulnar 2. radial 3. brachial 4 posterior tibial 5. lateral plantar
a. 1, 2, and 3 c. 1, 4, and 5
b. 2, 3, and 4 d. 3, 4, and 5
ANS: C
An Allen test should always be done before a radial artery puncture is performed to ensure that there is collateral circulation in the ulnar artery. An Allen type of test should be performed to en-sure collateral circulation in the posterior tibial and lateral plantar arteries when drawing arterial blood from the dorsal artery of the foot.
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