CAMRT Radiography Practice Exam

During venipuncture, the technologist should position the needle bevel at which angle to the skin's surface?

1. Up, 45 degrees

2. Up, 15 degrees

3. Down, 15 degrees

4. Down, 45 degrees

The correct answer is: Up, 45 degrees

The proper positioning of the needle bevel during venipuncture is crucial for an effective and safe procedure. By positioning the bevel facing up at an angle of 15 degrees, the sharp edge of the needle facilitates a smoother entry into the vein, minimizing trauma to the surrounding tissue. This angle also aligns the opening of the bevel with the lumen of the vein, helping to ensure successful access to the blood vessel. Using a 15-degree angle allows for controlled penetration and can reduce the risk of causing pain or phlebitis to the patient, which could occur with steeper angles. This technique supports the objective of the venipuncture, which is not only to access the vein effectively but also to do so in a manner that is comfortable for the patient and minimizes complications. Other angles, such as using a 45-degree angle or the bevel facing down, are less optimal for venipuncture. A steeper angle may increase the likelihood of puncturing through the vein or causing irritation to the tissues. Similarly, positioning the bevel down can hinder the entry into the vein and make it more challenging to secure blood flow, which is why the bevel facing up at a lower angle is the conventional approach in practice.