To perform the Allen Test, pressure should be applied to which arteries?

To perform the Allen Test, pressure should be applied to which arteries?

• A. Brachial and Radial
• B. Carotid and Jugular
• C. Ulnar and Radial
• D. Ulnar and Popliteal

Answer: (C)

The Allen Test checks whether the hand has enough collateral blood flow by compressing the two arteries that supply it at the wrist—the radial and ulnar arteries. By applying firm pressure to both, you temporarily stop inflow to the hand. When one artery is released, the hand should pink up quickly if the other artery can sufficiently supply blood. This is why the pressure is placed on the radial and ulnar arteries. The other pairings involve vessels not responsible for the hand’s main collateral supply and don’t test this pathway.

The Allen Test checks whether the hand has enough collateral blood flow by compressing the two arteries that supply it at the wrist—the radial and ulnar arteries. By applying firm pressure to both, you temporarily stop inflow to the hand. When one artery is released, the hand should pink up quickly if the other artery can sufficiently supply blood. This is why the pressure is placed on the radial and ulnar arteries. The other pairings involve vessels not responsible for the hand’s main collateral supply and don’t test this pathway.