Challenge Your Exam Readiness With Our Free Phlebotomy Practice Questions

Butterfly needles are designed for shallow angles and precise control, making them ideal for small or superficial veins. The recommended insertion angle is approximately 10–15 degrees with the bevel up. This orientation facilitates smooth entry into the vein lumen, reduces the chance of transfixing the vessel, and minimizes patient discomfort. A steeper angle (Option D) increases the risk of penetrating the posterior wall and forming a hematoma. Bevel-down (Option A) is discouraged because it can core tissue and impede flow. A “flat” approach (Option C) can cause skin tenting and partial entry without stable placement. Additional best practices include anchoring the vein, using pediatric/short-draw tubes to reduce vacuum, releasing the tourniquet within one minute and once flow is established, and gentle inversions per tube labeling. Proper technique with butterflies reduces hemolysis and improves first-attempt success—competencies emphasized across certification exams.