American Society for Clinical Pathology (ASCP) Histotechnician Certification Practice Exam

What is the best system to use for blood collections on patients with fragile veins?

1. Vacuum tube system

2. Butterfly needle system

3. Syringe

4. Standard needle and tube system

The correct answer is: Syringe

The butterfly needle system is considered the best option for blood collections from patients with fragile veins due to its design and functionality. This system comprises a small, flexible, and very sharp needle that has plastic "wings" on either side, allowing for a more controlled and stabilized grip during venipuncture. The small gauge of the butterfly needle minimizes the risk of causing damage to delicate veins, which is particularly important in patients with conditions such as older individuals, pediatric patients, or those undergoing chemotherapy. The flexibility and mobility of the butterfly needle allow for easier maneuverability during the collection process, enabling phlebotomists to access a vein without excessive manipulation that could lead to complications like collapsed veins or bruising. Additionally, the tubular structure can easily connect to a variety of collection devices, including vacuum tubes, which allows for multiple samples to be drawn without needing to change the needle. While other systems like vacuum tubes, standard needles, and syringes have their own merits, they may not provide the same level of gentleness and precision required for fragile veins as the butterfly needle system does.