In which scenario is a butterfly needle particularly recommended, and what disruption risk increases if used improperly?

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A butterfly needle is especially helpful when veins are difficult to access, such as small, fragile, or pediatric veins, because its smaller gauge and flexible tubing give you finer control and help minimize vein trauma during the puncture. But used incorrectly, it raises the risk of damaging the sample and the vein. The narrow bore and tubing can cause shear stress on red blood cells if blood is drawn too quickly or with excessive manipulation, leading to hemolysis. In addition, improper stabilization, angles, or movement can injure the vein wall and increase the chances of vein trauma or hematoma. So, use it for challenging venous access and apply careful technique to protect sample quality and vein integrity.