A butterfly needle is a device used to access a vein for drawing blood or giving medications. Some medical professionals call a butterfly needle a “winged infusion set” or a “scalp vein set.” The set ...

A bruise may appear after a blood draw if small blood vessels are damaged when the needle is inserted or if not enough pressure is applied after the needle is removed. A blood draw (phlebotomy) is a ...

While many other areas in the practice of medicine have been augmented by increasingly sophisticated technology, phlebotomy – the practice of drawing blood for laboratory analysis – has remained ...