Before an arterial blood gas is collected from the radial artery, an Allen's test is preformed to access the patency of which artery?

Question

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An Allen's test is performed to assess the patency of the ulnar artery before collecting an arterial blood gas from the radial artery. This is to ensure that the hand has adequate blood supply from the ulnar artery if the radial artery is compromised during the procedure.

Before an Arterial Blood Gas Is Collected from the Radial