Difficulty: Hard

Average Score: 49%

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 temporarily constrict blood flow in the veins, which causes them to engorge with blood, making them more prominent and easier to access during a venipuncture procedure. This increased visibility and accessibility of the veins is crucial for successful sample collection.

A (To block arterial blood flow) YOUR ANSWER

While a tourniquet does restrict blood flow, its primary purpose is not to block arterial flow specifically. Instead, it aims to enhance venous visibility by pooling blood in the veins. Blocking arterial flow could lead to complications and is not the intended use of a tourniquet during venipuncture.

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

This is the correct answer, as applying a tourniquet causes the veins to become engorged with blood, making them more pronounced and simplifying the process of locating and puncturing the vein for blood collection.

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

Although securing the area can help in stabilization, the tourniquet itself does not physically anchor the veins. Veins may still roll regardless of tourniquet application, and other techniques, like using a stabilizing hand, are typically employed to minimize this issue.

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

A tourniquet does not create any barrier between oxygenated blood and the collected sample. Its function is solely to increase venous pressure and visibility. The sample's oxygenation status is influenced by the type of blood collected rather than by the presence of a tourniquet.

Conclusion

The primary purpose of a tourniquet in a venipuncture procedure is to enlarge the veins, facilitating easier access for blood collection. While it has effects on blood flow, its design specifically caters to enhancing the visibility of veins, rather than blocking arterial flow or serving as an anchor. Understanding this function is essential for effective venipuncture and ensuring patient comfort and safety.

Related Questions

View all