Before Performing Puncture or Cannulation of the Radial Artery, What

Multiple Choice

Before performing puncture or cannulation of the radial artery, what should you do?

A) Fix and tighten a tourniquet above the antecubital fossa.
B) Perform the Allen test to ensure collateral circulation.
C) Inject heparin into the adjoining subcutaneous tissues.
D) Apply firm pressure to the arterial site for 5 min.