Final answer:
An antiseptic is used before a blood draw to prevent infection at the puncture site. It is applied to living tissues and is different from disinfectants, which are for non-living objects.
Step-by-step explanation:
An antiseptic is applied to the skin 30 to 60 seconds before the blood draw to prevent infection at the puncture site. Antiseptics are substances that are applied to living tissues/skin to reduce the possibility of infection, sepsis, or putrefaction. They are different from disinfectants, which are used on non-living objects. EMLA cream is an anesthetic cream, a tourniquet is a device used to apply pressure to a limb or extremity to limit but not stop the flow of blood, and a gauze pad is used to absorb blood or other fluids as well as protect a wound from infection, but not for initial microbial control.