NHA Phlebotomy Certification Practice Exam

Which of the following is a reason for using a tourniquet during venipuncture?

1. To make the vein more prominent

2. To reduce patient anxiety

3. To temporarily stop blood flow

4. To ensure sterility of the site

The correct answer is: To make the vein more prominent

Using a tourniquet during venipuncture primarily serves to make the vein more prominent. When a tourniquet is applied above the site of venipuncture, it temporarily restricts venous blood flow while allowing arterial flow to continue. This results in the veins becoming engorged with blood, making them easier to locate and puncture. Making veins more prominent is particularly important for successful venipuncture, especially in patients with smaller or deeper veins, or in individuals who may have difficulty with venous access due to dehydration, medical conditions, or body habitus. The visibility and palpability of the veins are enhanced, which can lead to a quicker and more efficient blood draw, reducing the number of attempts needed and minimizing discomfort for the patient. While the other options may seem relevant to different aspects of patient care or procedure management, they do not accurately represent the primary purpose of tourniquet use during venipuncture. For instance, reducing patient anxiety or ensuring sterility addresses patient comfort and infection control but is not achieved through the application of a tourniquet.