NHA Phlebotomy Certification Practice Exam

What is the correct technique for needle insertion during venipuncture on a patient of average weight?

1. Insert until a change in resistance

2. Insert the entire needle length

3. Insert at a 30-degree angle

4. Insert quickly to minimize pain

The correct answer is: Insert until a change in resistance

The technique of inserting the needle until a change in resistance is considered correct because it indicates that the needle has successfully entered the vein. When performing venipuncture, the healthcare professional should advance the needle until they feel a distinct shift, which typically occurs when the needle tip enters the lumen of the vein. This sensation alerts the phlebotomist that they are correctly positioned for blood draw, minimizing the risk of accidentally puncturing the surrounding tissues or missing the vein altogether. In venipuncture, maintaining an appropriate angle is important. Needles are usually inserted at a 15 to 30-degree angle to ensure a successful entry into the vein while minimizing discomfort for the patient. If a needle were to be inserted too shallowly or at an incorrect angle, the risk of complications increases. While quick insertion might seem beneficial to reduce pain, it does not guarantee an effective blood draw and could potentially lead to more discomfort or complications if not done with precision. Therefore, a careful and controlled insertion technique is essential for both patient safety and comfort.