Difficulty: Hard

Average Score: 33%

Which of the following is the purpose of a tourniquet in a venipuncture procedure?

Rationale

To enlarge the veins so they are easier to find and enter.

A tourniquet is applied to restrict venous blood flow, which causes the veins to become engorged with blood, making them more prominent and easier to locate for venipuncture. This practice facilitates the insertion of the needle and improves the success rate of the procedure.

A (To block arterial blood flow) YOUR ANSWER

While a tourniquet does impede blood flow, its primary purpose is not to block arterial blood flow but rather to enhance venous visibility. Blocking arterial flow can lead to complications and is not the intended use of a tourniquet in venipuncture.

B (To enlarge the veins so they are easier to find and enter) CORRECT

This statement accurately describes the function of a tourniquet in venipuncture. By restricting venous return, the tourniquet causes the veins to swell, making them more visible and accessible for needle insertion.

C (To anchor the veins and prevent them from rolling) YOUR ANSWER

Although anchoring veins is important during venipuncture, this is not the primary purpose of a tourniquet. Instead, techniques such as using the thumb to stabilize the vein serve this purpose better.

D (To create a barrier between the oxygenated blood and the sample collected) YOUR ANSWER

A tourniquet does not serve as a barrier between oxygenated blood and the sample. Its role is to manage venous flow, and it does not influence the oxygenation status of the blood being collected.

Conclusion

The primary purpose of a tourniquet in venipuncture is to enlarge the veins, making them easier to access for blood collection. While other options address related aspects of the procedure, they do not accurately reflect the main function of a tourniquet. Proper use of a tourniquet can significantly enhance the efficiency and success of venipuncture.

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