Which of the following is required as a supply for phlebotomy?

In phlebotomy, a tourniquet is essential for the procedure as it helps to engorge the veins, making them more prominent and easier to puncture. By applying a tourniquet above the site where the blood draw will take place, the blood vessels fill with blood, which allows for easier access and minimizes the risk of complications during the blood draw.

The other options listed are not relevant to the phlebotomy process. An ear thermometer is used for measuring body temperature and does not assist in blood collection. Scissors are not utilized in blood draws and have no role in the process. An electrocardiogram machine is used to monitor heart activity, which is also unrelated to phlebotomy. Thus, the tourniquet is the only item among the choices that is crucial for successfully performing a blood draw.