Before drawing a sample for arterial blood gas analysis, the nurse assesses the collateral circulation to the hand with Allen’s test.
- Allen’s test involves compressing the radial and ulnar arteries and asking the client to close and open the fist, which should cause the hand to become pale. The nurse then releases pressure on one artery and observes whether circulation is restored quickly. The nurse repeats the process, releasing the other artery. The blood sample may be taken safely if collateral circulation is adequate.
Tuesday, November 18, 2008
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