NHA Phlebotomy Certification Practice Exam

What is the correct positioning of the needle when using an evacuated tube system?

1. At a 10 degree angle to the skin

2. Positioned towards the floor

3. In the same direction as the vein at a 30 degree angle

4. Centered over the vein at a 45 degree angle

The correct answer is: In the same direction as the vein at a 30 degree angle

The correct positioning of the needle when using an evacuated tube system involves aligning the needle in the same direction as the vein at a 30-degree angle. This angle is optimal for penetrating the vein without causing excessive trauma to the surrounding tissues, ensuring better success in blood collection. Positioning the needle in this manner allows for the bevel of the needle to enter the skin first, which facilitates a smoother entry into the lumen of the vein. The 30-degree angle strikes a balance between being steep enough to successfully enter the vein and not so acute that it increases the risk of piercing through the vein. Utilizing this technique also helps in reducing the chances of hemolysis and ensures that the blood flows efficiently into the evacuated tube, providing more accurate test results. Proper needle angling is essential for effective blood collection practices in phlebotomy, leading to better patient experiences and outcomes.