What test should the nurse do as a precautionary measure before doing an arterial puncture to obtain an arterial blood sample?
a. Allen test
b. Smith test
c. Venipuncture
d. Cold compress
ANS: A
The Allen test determines the adequacy of collateral circulation in the extremity distal to the proposed puncture site. If the child does not have satisfactory circulation when the proposed artery is occluded, that extremity is not used. The Smith test, venipuncture, and a cold compress are not done before arterial blood gas sampling.
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